I've got a 1937 Brazilian contract revolver that came from an estate sale. Supposedly, the gentleman who owned it had it for many, many years. It is in 90-95% condition with very slight edge wear in a few places, perfect bore and cylinder, perfect timing, no end shake, a tight B/C gap and very strong case coloring on the hammer and trigger. According to the Blue Book, 25K were made and 14K were imported. It puts a premium value on the non-imported guns. How can I tell if mine was imported or not? Its serial number is 2080XX and it has the round top frame. The gun came to me wearing a set of magna grips, exactly like the ones that came on the 58 or 520. They are numbered in the 190XXX range so I know they are not original to the gun. But I gather from others that have provided pics of theirs, the round bottom magna type grips are not original to the gun. I'd like to know if this gun was made before WWII or after, and whether it was an import or a non-import gun.

Any help you can provide will be appreciated.
Keith