Seiko 6106 8100 from June 1968 which is a sports watch aimed at the splashing about in the water rather than the hardcore dive market.Some of the period adverts are clearly aimed at the surfing market and the watch is not as robust as say a 6306 or a 6309. Not very rare as seiko made endless versions of the 6106 with various dial variations but the movement is rock solid although a lot of examples now show a fair bit of wear
This is a nice example but I need to hunt down an original bracelet to finish it off
www.fratellowatches.com/tbt-the-vintage-seiko-sport-divers provides some additional info on this largely overlooked model
Belated college graduation present to myself-wearing at Red Sox Spring Training Ft Myers, FL
Seiko Yachtmaster (sometimes known as UFO) with Proof dial and case
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Lovely watch and I swapped mine onto a replacement strap from http://www.uncleseiko.com/store/p5/6138_UFO_and_Slide_Rule_Solid_Link_Bracelet.html which suits the bulky case as it is similar to the original for model 6138 - 001 (GE) AV01
I have no affiliation with him but have bought several bracelets and been impressed with the fit and build quality