StoreDeal.ai store
Shop
  • Deals
  • Deal checker
  • Black Friday
  • Buying guides
  • Brands
  • Stores
Travel
  • Flight deals
  • Hotel deals
Company
  • Research
  • Press
  • Use in AI assistants
  • Contact
  • deal.ai apps
Black Friday 2026
  • Walmart
  • Best Buy
  • Target
  • TVs
  • Laptops
  • Headphones
  • Apple
  • Gaming
  • Vacuums
  • Kitchen
  • Toys
  • Smartwatches
  • Tablets
  • Furniture
  • Mattresses
© Deal.ai Inc.·2222 Ponce de Leon Blvd, Miami, FL 33134·support@deal.ai
TermsPrivacy
Deal.ai › Compare

Seiko Prospex Automatic Diver SRPL13 vs Seiko Prospex SRPL51 Diver

These are the same watch underneath: both use the 4R35 movement, the same 41.7mm stainless case, Hardlex crystal, 200m diver's rating and 20mm lugs. The real difference is the look. The SRPL13 is the Samurai-style case with its sharp angular edges and black dial and bezel. The SRPL51 is the same platform in a different finish and dial treatment, and it lists magnetic resistance at 4,800 A/m. Buy whichever dial and case finish you prefer wearing. Owners praise the 4R35's reliability and the solid bracelet, and criticize the Hardlex for scratching and the 4R35 for running a few seconds off per day.

  • Choose the SRPL13 if you want the sharp-edged Samurai case profile and a plain black dial and bezel.
  • Choose the SRPL51 if you prefer its dial and finish and want the magnetic resistance figure spelled out.

Prices

  • Seiko Prospex Automatic Diver SRPL13: $476.00 at Teddy Baldassarre (last seen Nov 10)
  • Seiko Prospex SRPL51 Diver: $419.00 at Paramount Jewelers (last seen Nov 9)
  • Difference: the Seiko Prospex SRPL51 Diver is $57.00 cheaper than the Seiko Prospex Automatic Diver SRPL13 at the latest prices (Nov 9 and Nov 10)
Seiko
Seiko Watch - Prospex Automatic Diver - SRPL13

Seiko Prospex Automatic Diver SRPL13

Seiko Watch - Prospex Automatic Diver - SRPL13

4.7(13 ratings)
$476.00at Teddy BaldassarreChecked Nov 10
See all prices and details
Visit Teddy Baldassarre
Pros
  • Samurai-style angular case that stands out from round divers
  • Proven 4R35 with hand-winding and hacking
  • ISO diver's build with screw-down crown and 200m rating
  • Date window for daily wear
Cons
  • Hardlex scratches more easily than sapphire
  • No magnetic resistance figure listed
  • 170g is heavy on a smaller wrist
  • Bezel insert is aluminum, not ceramic
Seiko
SRPL51 Prospex Mechanical Diver's 41.7mm

Seiko Prospex SRPL51 Diver

SRPL51 Prospex Mechanical Diver's 41.7mm

5(2 ratings)
$419.00at Paramount JewelersChecked Nov 9
See all prices and details
Visit Paramount Jewelers
Pros
  • Same reliable 4R35 and diver's build as the SRPL13
  • Magnetic resistance rated at 4,800 A/m
  • LumiBrite also on the bezel
  • Stop-seconds and date display spelled out
Cons
  • Hardlex crystal, same scratch risk
  • Same 170g weight and 49.5mm lug-to-lug
  • 4R35 accuracy is modest, roughly -35 to +45 seconds a day
  • Bracelet clasp is functional, not refined

What separates them

Seiko Prospex Automatic Diver SRPL13Seiko Prospex SRPL51 Diver
Movement4R35 automatic with manual winding, 23 jewels, about 41 hours reserveSame 4R35, 23 jewels, about 41 hours reserve
Case and sizeStainless steel, 41.7mm wide, 12.3mm thick, 49.5mm lug-to-lugIdentical dimensions
CrystalHardlexHardlex
Water resistance200m diver's, ISO-rated, screw-down crown and caseback200m diver's, screw-down crown and caseback
Magnetic resistanceNot stated4,800 A/m
Dial and bezelBlack dial, black unidirectional elapsed bezel, date at 3Different dial and bezel finish on the same case platform
Weight170g170g
LumeLumiBrite on hands and markersLumiBrite on hands, indexes and bezel

Price history

  • Seiko Prospex Automatic Diver SRPL13: lowest $478.00 on Nov 8 at Paradise Jewelry; $478.00 on Nov 10.

Prices at every store

Seiko Prospex Automatic Diver SRPL13

  • Teddy BaldassarreNew

    In stockReturn policy

    $476.00Checked Nov 10
    Visit Teddy Baldassarre
  • Time Square Clock ShopNew

    In stockReturn policy

    $476.00Checked Nov 10
    Visit Time Square Clock Shop
  • Mimo's JWNew

    In stockReturn policy

    $515.00Checked Nov 10
    Visit Mimo's JW
  • Paradise JewelryNew

    Availability unknown

    $478.00Checked Nov 10
    Visit Paradise Jewelry

Also available at

  • Seiko USACheck price at Seiko USA
  • Topper Fine JewelersCheck price at Topper Fine Jewelers
  • Gem BijouCheck price at Gem Bijou
All 26 stores and price history →

Seiko Prospex SRPL51 Diver

  • Paramount JewelersNew

    In stockReturn policy

    $419.00Checked Nov 9
    Visit Paramount Jewelers
  • Teddy BaldassarreNew

    In stockReturn policy

    $476.00Checked Nov 10
    Visit Teddy Baldassarre

Also available at

  • Arizona Fine TimeCheck price at Arizona Fine Time
  • ELI ADAMS JEWELERSCheck price at ELI ADAMS JEWELERS
  • Gem BijouCheck price at Gem Bijou
All 2 stores and price history →

Specs compared

SpecSeiko Prospex Automatic Diver SRPL13Seiko Prospex SRPL51 Diver
Power ReserveApprox. 41 hoursapproximately 41 hours
Jewels2323
Case Thickness12.3mm12.3 mm
Case Diameter41.7mm41.7 mm
Lug-to-lug49.5mm49.5 mm
CrystalHardlexHardlex crystal
Water Resistance200m / 660ft diver’s200 meters (660 feet), suitable for scuba diving
Weight170.0g170.0g
Caliber Number4R35—
Movement TypeAutomatic with manual winding—
Case MaterialStainless steel—
Distance Between Lugs20—
Show all 16 specsShow fewer specs
SpecSeiko Prospex Automatic Diver SRPL13Seiko Prospex SRPL51 Diver
Movement—Automatic with manual winding
Caliber—4R35
Lug width—20 mm
Magnetic resistance—4,800 A/m

What reviewers say

Seiko Prospex Automatic Diver SRPL13

  • 4.7 / 513 ratings

Owners rate it highly, praising the compact Samurai case, the lume and the solid feel for an automatic diver. Complaints center on the Hardlex crystal and the watch's weight and size on smaller wrists.

What people mention
  • Case sizeMixedOwners like the slimmer Samurai profile but say 41.7mm wide and 49.5mm lug-to-lug still wears big on small wrists.
  • LumePraisedLumiBrite hands and markers stay bright through the night.
  • CrystalCriticisedBuyers wish it had sapphire, since Hardlex scratches with daily wear.
  • MovementPraisedThe 4R35 keeps good time and the 41-hour reserve covers a weekend off the wrist.

Seiko Prospex SRPL51 Diver

Owners of Seiko's 4R35 divers generally rate the line highly for lume, build and value. Common complaints are Hardlex scratching and the movement running fast or slow out of the box.

What people mention
  • LumePraisedOwners say the LumiBrite on hands, indexes and bezel stays bright well into the night.
  • CrystalCriticisedHardlex is the most common gripe; users report scratches and wish for sapphire.
  • AccuracyMixedThe 4R35 keeps reasonable time for many, but some examples run noticeably fast or slow.
  • BuildPraisedThe steel case, screw-down crown and bezel are described as solid and well finished for the class.

Questions and answers

Are the SRPL13 and SRPL51 the same watch?
Mechanically yes. Both run the 4R35, share the 41.7mm case, Hardlex crystal and 200m diver's rating. They differ in dial, bezel finish and the magnetic resistance listing.
Which is better for actual diving?
Either. Both are rated to 200m for scuba with a screw-down crown and caseback and a unidirectional bezel. The SRPL51 adds a stated 4,800 A/m magnetic resistance.
Which lasts longer?
The movement and case are identical, so service life is the same. The 4R35 is a durable, serviceable caliber. Hardlex will pick up scratches on both over time.
Is the SRPL51 worth stepping up to over the SRPL13?
Only if you prefer its dial and want the magnetic resistance spec. There is no upgrade in movement, crystal or water resistance.
Does either have a sapphire crystal?
No. Both use Seiko's Hardlex mineral crystal. Aftermarket sapphire swaps are common on this case size.
How accurate is the 4R35?
Seiko rates it around -35 to +45 seconds a day. Most owners see better in practice, but expect to reset the time every week or two.

Ask our shopping agent

It checks today's price at every store, compares the alternatives and answers in about a minute.

Enter to send, Shift+Enter for a new line

More comparisons

  • Seiko Watch - Prospex Automatic Diver - SRPL13 vs SRPL15 Prospex Samurai Diver 41.7mm
  • Seiko Watch - Prospex Automatic Diver - SRPL13 vs Invicta Men's 18508 Pro Diver Gold Dial Yellow Gold Steel Bracelet Automatic Dive Watch
  • SRPL51 Prospex Mechanical Diver's 41.7mm vs Invicta Men's 18508 Pro Diver Gold Dial Yellow Gold Steel Bracelet Automatic Dive Watch
  • SRPL15 Prospex Samurai Diver 41.7mm vs SRPL51 Prospex Mechanical Diver's 41.7mm

Buying guides that pick them

  • Best automatic dive watch homages