I've only ever seen 1 1945, that was around 2011 when you could still find all kinds of really unique stuff. I've never seen a 1946, I didn't know they existed to be honest. A handful of 1947s and 1950s have come up.According to production figures on M9130.info, an unspecified number of 91/30s were produced in 1945 as velocity test rifles and 1,250 PUs accepted from 1944 production during 1945, none shown in 1946, and 2,843 strictly PU models in 1947.
But official numbers don't always tell the whole story, and observation proves this is the case here. For one thing, the 1946 91/30s which aren't even shown in the official records are in my experience the most often encountered postwar 91/30s. I've seen several in person, and used to own one that I pulled out of a crate of refurbs at Bud's and bought for the princely sum of $120.
BTW, I know of at least 3 1945 91/30s coming out of the refurb crates that KY Gun Company was selling a few years back. We didn't know about the CK marking (for velocity test rifles) back then, so I don't know whether they were so marked, but they probably were.