I recently picked up this rare early Heiser double buscadero rig for a two .38 S&W M&Ps. The holsters are of the Heiser double loop pattern. Probably from around 1930. It fits my matching pair of gold plated and engraved .38 M&Ps shown with the rig.
We're the same players as on Coltforum, where we first saw this set . Very nice, most likely made late 1930s to 1945 when Heiser changed hands; because of the belt's introduction date and because the carving is the first-quality that Heiser put out in its early years. Its engravers went over to Colorado Saddlery at that time.