These RB molds left to me .. The two molds I guess are very early . First I have seen like this. The large RB mold has a .45 stamped on it's bottom. The ball that came out of it measures .450. Perhaps for a cap & ball revolver?? The other smaller mold , as best as I can measure, seems to be .350. They are not fitted with a spreu cutter/plate. Looks like you cast the ball, then snip the spreu off. They both appear to be in great working condition. Any info would be appreciated.