Knowledge Center

Professional Authentication Platform

Some specifications for this reference are on file; the record is incomplete.

Doxa · SUB

SUB 300T Conquistador

Ref. SUB 300T Conquistador

currentSaturation-diving eraPartially documentedLast reviewed Not yet reviewed

Missing informationCore fields not yet documented for this reference: Case diameter, Caliber

Reference photography not yet on file

The helium escape valve is the reference's defining feature and is a real fitting in the case wall, not a marking. It exists to vent helium that has permeated the case during saturation decompression, which is a problem confined to commercial saturation diving — the valve is genuinely useless to a recreational diver, and its presence on a watch is therefore about lineage rather than function.

Some specifications for this reference require verification against manufacturer documentation.

At a glance

Brand
Doxa
Collection
SUB
Reference
SUB 300T Conquistador
Production
1969–present
Caliber
Automatic
Case material
Stainless steel

Related references