Have a 640-PC .357; tried three holsters, none have been IMHO been a good fit.
Also the revolver is to heavy for pocket carry in Florida, it prints "is that a S&W 640 in you're pocket...happy to see me".
I had a 640-1 I purchased new in 1996. I bought a new Bianchi
55L " Lightning" thumb snap tan holster marked for the S & W
640. I sold the 640-1 a couple of years ago, but still have the
holster. Contact me if interested.