I found the answer.
Western Arms Corp was an importer in the 1960's and 1970's, but got sued by Winchester-Western over the company name. It became Allen Firearms in 1984, named after the owner.
In 1987, the company was bought out by Cimarron.
According to the date code, my revolver was made in 1977
I still have an Allen Firearms Old Model Single Action in .45. Bought it new in 1984, did an action job on it right out of the box, and have only had a problem once or twice since then. Trigger/sear spring got weak and put the timing out slightly. I could not commence to tell you how many rounds has been through it. Used it for fast draw briefly. Good gun!