You're a well of information and I appreciate it! My confusion stems from knowing that Bulova made Accutrons, and my assumption that all crowns ordered from them having a particular part number would be identical. But I now understand (I think) that they sold Bulova branded crowns as well as Accutron branded crowns with the same part number, though they came in packages that either said "Accutron" or "Bulova", and they had different signatures on the crowns.
Is it also correct then that a crown having BULOVA on it and in factory packaging that says "Snorkel Crown 386-3 Genuine Bulova" as you show would also be correct for your Oceanographer Snorkel? So in spite of it not having the "W" it must also be watertite?
O-Ring / Gasket for case ref# 702 uses --------- Case Back Gasket is # G799
other misc. parts info.
Crystal - 702AWD
Crown - 702W
Bezel ring - B150
Bezel spring - B.S. 150
Any Stem for the 2181 (218)
Fortunately the gaskets are still avail and just bought one. But as you know, the crystal and bezel are pretty much unobtainable.