Not easy to tell from that one picture but, it looks nice and original. It appears to be a 166.0027 with a 565 calibre movement. The difficulty with these is getting a nice bezel as they are NLA. Yours has a very good bezel. Hands look correct as does the dial. The prices of these are on the up so, it would be a buy from me. Of course, check it out properly as that one picture is none too good.
If this helps for you to compare, here's a front shot of mine. Apologies that the bezel is slightly rotated, dust and the very long exposure so, no seconds hand. However, you can see the dial and fonts clearly.
View attachment 152329
And the back.
View attachment 152330
Good luck, Chris
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