Hamilton must have about 30 or more models named Sea-something. So many, in fact, that they took to adding roman numerals to mark new models. A good example is the 1965 Sea Mate II. It's a completely different model than the 1959 Sea-Mate issued a few years earlier.
The Sea Mate II was one of a few watches that continued to be produced after 1969 - the year Hamilton was sold to what is now the Swatch Group. It was produced until 1971. Three dials where available... a white butler finished dial, a black dial and also a masonic dial.
The case is 10k rolled gold plate, RGP, with a stainless steel back. It opens through the crystal so it has a two-piece stem. I have found that these one-piece cases with a gold bezel and stainless back must be confusing to a lot of people - as it's not unusual to see pry-marks on the back where someone has tried to separate the two sections.
Inside is a Swiss-made Hamilton 688 movement... the same as an ETA 2390 with 17 jewels.
I recently picked up a Sea Mate II project watch. After an overhaul, dial cleaning, new crystal and a strap - I think it turned out fantastic.
Thanks for visiting my vintage Hamilton watch blog. I like to restore US-made Hamilton wrist watches back to their original glory and share my experiences with other enthusiasts. Use the "Search" space below if you know what model you're looking for. Feel free to leave polite comments or questions in the spaces provided. Also check out my "watches for sale" on my Etsy site - the link is on the right, just below.