I have learned a lot about Iver Johnson and their US Revolver Co. makes, but I still need to get a closer date range of when my US revolver co. top breaks were made. Hopefully they are made in the later run of the US Revolver Co. name so i can use modern cartridges. The two I have seem to have the same moving parts as the IJ model 2s which i hope these USs are not made of the model 2 leftovers like some of the earlier ones were made of. These have been checked out by my local gun smith who has been in the biz for 40 years and was deemed ok to shoot.
I have a .38 larger frame of the two and appears to be around a 3 in barrel.
SN 6833 no prefix
.32 smaller frame of the two with 3 in barrel.
SN 44127 no prefix
This is a picture of the .32
I don't plan to shoot these that much, just maybe five rounds when I go to the range which is once a month. These are heir looms and if SHTF I may use these as a last resort.