MMM Colorado are sought after pieces, however, very little information about this old refiner has been uncovered. The first gens only come with an MMM Stamp and typically are sub 5 oz. Later varieties, assuming they are related and the same refiner, have the MMM with the Colorado stamp. These range from sub 3 oz up to 10 oz from what I’ve seen. Looking for more information on these.
Pictured here is the MMM with Colorado stamp.
I received a new MMM first gen image today from Jon M. Thanks for sharing this sub 2 oz example
I have seen the MMM Colorado with gram stamps on reverse, and with Oz Troy on reverse. I have one of the later.