Be careful what you buy. The older ones had serious accuracy problems with any ammunition other than Remington and it wouldnt go bang reliably. This problem only showed up as Remington's quality went to Hell. If you wanted accuracy with any other ammunition, it took a new barrel and they are not easy to find or cheap. I was one of the unfortunates. The 41'sw made in Holton, ME are 100% ok. PM me if you need more info. I've been shooting the 41 off and on since 1960.
What are you classifying as old ?