Sub 300T

The DOXA Sub 300T brings together a broad, cushion-shaped case, a highly legible dial, and a rotating bezel that pairs elapsed minutes with a depth-based no-decompression scale. Those details connect late-1960s examples with modern watches, but the family name spans generations—not one fixed set of dimensions or mechanical specifications.

Introduced in 1969, the Sub 300T followed the original SUB 300 into DOXA’s distinctly practical approach to dive-watch design. Vintage examples and later reissues share the short-lugged silhouette and prominent minute hand, while case construction, movements, crystals, and depth ratings have evolved. Modern 42.5mm versions bring sapphire crystals, a helium-release valve, and a 1,200-metre water-resistance rating; those specifications should not be read backward onto earlier watches.

Dial names provide another useful way into the family. Professional denotes the familiar orange, Sharkhunter black, Searambler silver, and Caribbean blue. Orange gives the minute hand’s working environment its strongest visual identity; silver shifts attention toward the contrasting hands and markers. The beads-of-rice bracelet is another recurring signature, though its construction and clasp differ across generations.