Available$1,47840mm

Isotope Watches
Hydrium Grey Reef Shark
No restock pattern is established yet. Track to get alerted if it returns.
A Dive watch, in a round stainless steel case, 40mm, with a gray swirled/spiral guilloché dial, lollipop hands, powered by the Landeron 24.
Right now, this reference is sold out and cannot be bought. Relative to its segment, the asking price here sits 30% above the median, toward the higher end of what similar watches cost. This segment covers 255 tracked dive watches in this size and price class, ranging from USD 1,008 to USD 1,995.
Diameter
40mm
Lug to lug
48mm
Between lugs
22mm
Thickness
14.9mm
Weight
150g
Movement Type
automatic
Movement Name
Landeron 24
Power reserve
40 hours
Water resistance
30 bar
Crystal Type
sapphire
Crystal Description
Sapphire crystal with anti-reflective coating
Currently sold out. Scarcity score: 42/100. No restock data yet. That puts it in roughly the top 10% of tracked dive watches in this class. Its scarcity score has climbed about 14 points over the past 303 days. This reference's scarcity is roughly 42 points above what's typical for Isotope Watches.
Track for the next window
Limited data
No reliable restock cadence is established for this reference yet.
42
November 2025
Scarcity score · today
Demand, sellout velocity, and restock cadence unlock as Chronoscout gathers more market data on this reference.
Last confirmed:
3 availability changes recorded. Available 2 times; most recently for 1 day, on 9/3/26. Longest sold-out stretch: 12 days. Last restocked on 9/3/26.
Tracked since 11/12/25 (309 days).
Sold out9/5/26
13 days straight
March 2026
Today
Available · for 2 days9/3/26
Sold out · for 10 days8/24/26
11 older transitions back to 11/12/25 are available with Collector. Unlock full history
Currently priced at $1,694.00, with 4 price changes recorded over the tracked period. The lowest recorded price was $1,665.00 on 11/14/25; the highest was $1,729.00 on 1/27/26. That's up from the $1,665.00 it was first tracked at.
$1,694.00 USD9/17/26
Unchanged · 64 days
$1,665.00
Mid-range for the tracked period
$1,729.00
$1,714.00 · up $41.007/16/26
$1,673.006/19/26
3 older price changes back to 11/14/25 are available with Collector. Unlock full history
Don't find out too late
Our weekly digest newsletter covers every new release from 340+ brands.
480+ subscribers · unsubscribe anytime
© 2026 chronoscout.co
all rights reserved
VAT EU372094125
VAT GB 515 677 276
built by Katalyze. in Switzerland
🍪 Cookies
We use cookies to analyze site usage and improve your experience, in accordance with our Cookie Policy .
Would you like to enable cookies for analytics?