In support of Ralph's and Bill's posts above,
"THE S. & W. ".357" MAGNUM", an 8-page pre-war brochure included the order forms on the last page. There were several versions of this brochure (I have examples of three different versions, one of which is the later version in Spanish). As I think it adds to the grip adapter discussion, here are a few scans of the relevant brochures:
Front Cover (Early Version):
Last Page / Order Form (Early Version):
Front Cover (Later Version):
Last Page (Later Version):