This will help. I will verify when I get up to the boat. From the initial link, it is definitely in the Earlier Standard Winches category. They are jib sheet, not self tailing.
For your boat size and being these are for the jib/Genoa I will venture a SWAG.
If a previous owner (like many of us do when new technology comes out and solves our identified problems) did an upgrade then possibly in the 24/30/40 group.
On the other hand, if the previous owners preserved the boats 1977 OEM build, then the 8/10 for single speed and the 16/25/40 for two speed winches are likely. They both were introduced in 1972 to 1976 period.
Here is a site that will help with the older winch designs.
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