You are looking at a Watches of Switzerland Seafarer automatic with date window, dating from the mid to late 1960's.
It is running well and keeping good time. The date changes, as it should, at midnight.

The stainless steel case features the patented BREVET 313813 compressor system. I haven't removed the SS back to the case. I believe this is a snap on designed case, the compressor system working as the water pressure increasing when diving lower, which further compresses the seal. This means that there is only high pressure on the seal when it is needed and gives a longer life to that seal over other methods of waterproofing. The watch features the correct cross hatched compressor crown.

SS back engraved with BREVET 313813 and 6002/CA.

I believe the case houses the ETA cal 2472, 17 jewelled automatic movement. Running great and keeping good time.

It is fitted with a black leather watch strap. Lug width is 18mm and diameter of watch is 35mm, not including the crown.
The crystal has the usual fine scratches you would expect from a watch approaching 60 years of age.

Will post worldwide using Ebay's Global Shipping Programme. Buyer responsible for all international postage costs, local taxes/customs fees, etc....

Any questions, please ask.