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Isotope Watches Hydrium California

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This watch is available for purchase directly from the brand's website.

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About this Watch

A Dive watch, in a round stainless steel case, 40mm, with a black granular textured dial, sword hands and applied metal indices, powered by the La Joux Perret G101 / Landeron.

It is currently available to buy directly from the brand. Within its segment, this reference is priced near the middle of the pack, close to what comparable watches typically 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

12.9mm

Movement Type

automatic

Movement Name

La Joux Perret G101 / Landeron

Power reserve

68 hours

Water resistance

30 bar

Crystal Type

sapphire

Crystal Description

Double-domed sapphire crystal with anti-reflective coating

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Statistics

With a scarcity score of 0/100, this reference ranks in roughly the bottom 10% among tracked dive watches in its class. Its scarcity score has fallen about 53 points over the past 354 days. The high point in that window was a score near 53, reached in September 2025. That's in line with Isotope Watches's catalog overall.

On average, roughly 37% of Isotope Watches's tracked models are available at any given moment.

Worth tracking
Limited data
Currently available with no strong urgency signal either way.
Scarcity score
Modeled
Based on Time unavailable. Reference evidence · 376 days · 0 availability changes · high confidence
0/100
Scarcity rank (in its segment)Upgrade
Price vs segmentUpgrade
Brand restocks every
Brand avg
~1 days
Brand in stock
Brand avg
~37%

Availability

Last confirmed: 9/17/26, 3:46 PM

Tracked since 5/2/25 (503 days).

Available2/17/26
7 months straight
March 2026
Today

16 older transitions back to 5/2/25 are available with Collector. Unlock full history

Price

Currently priced at $1,251.00, with 10 price changes recorded over the tracked period. The lowest recorded price was $1,243.00 on 6/18/26; the highest was $1,555.00 on 1/27/26. That's down from the $1,535.00 it was first tracked at.