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Alternatives to Omega Seamaster Diver 300M 42 mm, steel ‑ Sedna™ gold on steel ‑ Sedna™ gold, with the reasons they match.

Prices within 35% of this piece, with at least one matching specification. Case size, strap, dial color and watch type guide the order when known. One reference per brand appears before repeat brands.

Rolex logo
Rolex Sea-Dweller
43 mm · Automatic

Similar price · 43 mm case · Dive watches

Ref. m126600-0002
Brand price$14,550 USD
Tudor logo
Tudor Black Bay Chrono S&G
41 mm · Automatic

Similar price · 41 mm case · Both on bracelets

Ref. m79363n-0001
Brand price$10,825 USD
IWC logo
IWC Portugieser Automatic 42
42.4 mm · Automatic

Similar price · 42.4 mm case · Both on bracelets

Ref. IW501704
3.4% higher than in Jun 2026+$500 · Jun 18, 2026 – Oct 23, 2026
Brand price$15,400 USD
Bell & Ross logo
Bell & Ross BR-X3 Night Vision
41 mm · Automatic

Similar price · 41 mm case · Black dials

Ref. BRX3R-GN-CA/SRB
4.3% higher than in Jun 2026+$600 · Jun 18, 2026 – Oct 23, 2026
Brand price$14,700 USD
Grand Seiko logo
Grand Seiko SLGC001
43.2 mm · Automatic

Similar price · 43.2 mm case

Ref. SLGC001
Brand price$14,700 USD
Oris logo
Oris Artelier Calibre 111
43 mm · Manual winding

Similar price · 43 mm case

Ref. 01-111-7700-6061-Set-1-23-78
Brand price$15,500 USD