The Bronze Field Guide

Phoibos Proteus Bronze 300M

PY046A

The Phoibos Proteus Bronze 300M is a current-production diver watch with a cusn8 bronze (copper with 8 percent tin) case. It measures 42.0 mm across, 13 mm thick, 49 mm lug to lug, 121 g, and is water resistant to 300 m. Inside is the Seiko NH35 japanese automatic movement, with 41 hours power reserve. Complications: Date. Priced from $375. Brand origin: Hong Kong.

Bronze diver watchesCuSn8DiversUnder $500
Reference
PY046A
Type
Diver
Price
$375
Case diameter
42.0 mm
Thickness
13 mm
Lug-to-lug
49 mm
Water resistance
300 m
Weight
121 g (head only)
Origin
Hong Kong
Movement
Japanese automatic
Caliber
Seiko NH35
Power reserve
41 hours
Complications
Date
Ceramic
CuSn8 marine bronze
Colour
–
Hardness
–
Construction
Assembled
Surface treatment
–
Caseback
–
Nickel-free
Not verified (contact-point materials not all confirmed)
Bracelet / strap
Leather strap with bronze buckle
Ceramic bracelet
–
Crystal
Domed sapphire with inner AR coating
Display back
No
Dial
Forest green (also navy, salmon, white)
Lume
Super-LumiNova
Availability
Offered
Status
Current
High confidence Verified Jul 2026 Source: Phoibos / Long Island Watch Maker / listing ↗
Facts are free to cite with a link.
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Frequently asked questions

What bronze alloy is the Phoibos Proteus Bronze 300M?

The Phoibos Proteus Bronze 300M has a cusn8 bronze (copper with 8 percent tin) case. This is confirmed against the maker spec.

What size is the Phoibos Proteus Bronze 300M?

It is 42.0 mm in diameter, 13 mm thick, 49 mm lug to lug, and water resistant to 300 m.

How much does the Phoibos Proteus Bronze 300M weigh?

About 121 g (head).

How much does the Phoibos Proteus Bronze 300M cost, and is it available?

It is current-production and lists from $375.

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