Jerry,
If you go down the forum list starting from Pow Wow I think it’s the 17 th forum called “Vintage/ bows collecting and click on that .
Once you do that go down 26 posts and look for the title called vintage catalogs and click on that link that HUD has provided.
Look for the year and Howatt and a catalog will show the year possibly. May have to go through all the years of the Howatt line of bows.
Now as far as cleaning up that bow and removing the old grime you can get this as Lowe’s .
It works great and I’ve done many.It is under $10.00 a can...