F2 Strato 80s Fin Replacement: Identifying the Correct Fitting

Question
I have an F2 Strato from the 80s which has a broken fin.  Do you know what kind of fitting it uses? Theres not a lot of information out there on it but it looks to me like a US fitting but I can't be sure since it's so old.  

Thanks!

Answer
Hey Will,

It is highly likely that your board requires a US Box fin. It is also described as an A Box and Chinook box.

Here is a picture of the type that your board should use. Your broken fin should have looked like this on the part that goes into the box.

http://www.windance.com/MFC-2K-Fin.html

There are new fins available at many online shops but you can find used ones on ebay and craigslist.

Hope this helps.
Keep on sailing,
Windlover