My first guess would be Altamont grips. They make oem grips for S&W and others. I have recently bought several pairs from them, having decided to dress up some of my Smiths, also the Beretta I shoot IDPA with. Those might have come on your 625. They look a lot like some that have come on S&W Performance Center guns and distributor specials.
Look on Altamont web site.