DEPUTY
I have one and on the left hand side of the barrel it says:
MOD. 1894 - CARBINE - MICRO-GROOVE - CAL. .357 MAGNUM
I don't know for sure, but I think that if it were Ballard, it would say that specifically or it would be left out completely.
Either way, if it is MICRO-GROOVE, it should be stamped right on the barrel.