GS 5722 -9990 with unusual 5722b "chronometer" movement

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Hi all, first post. I'm here hoping for some insight form the resident experts on my grand seiko 5722 -9990 'chronometer' dial from November 1965.

I acquired it a few years ago via a private individual based in Singapore. I dropped him a random message on his Insta a struck a deal from there.

As I can tell the dial is all original and in excellent condition, as is the beautiful gold lion medallion case back.

What I find interesting and I hope I you will to is that my watch actually has a 5722b movement that is signed as a 'chronometer' like the prior 5722a movements. I appreciate that a later 5722b movement from a 9991 model in a 9990 case / caseback/ dial combo is nothing unusual by itself but all the info I have found seems to indicate that Seiko dropped the "chronometer" markings from their 5722b movements (and dial) when they moved to the 5722-9991.

I wonder if my watch could be some transitional piece wherein Seiko moved to the 5722b movement but in a 9990 model, whilst they were still maintaining the official chronometer certification.

It could be a fake.... I suppose....I'm not an expert but it would be a pretty ambitions / strange thing to fake I guess. The caseback and dial are all 9990

It's a beautiful watch, but I don't enjoy it as regularly as it deserves.





 
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These and the earlier 45899 are some of my favorite GS references.