Bought these two receiver covers this morning. One is 1946, the other 1948. Neither is demilitarized. It seems like both are from trial rifles converted to training rifles. The 1946 is the 1st un-cut 1946 receiver cover I have ever seen. Previously, Gunboards forums member Ratnik kindly posted pics of de-activated refurb 1946 dated SKS training rifle sold in Russia (deactivated in Ukraine). Unfortunately, the receiver cover on that rifle was cut in center on top for demilitarization, resulting in partial destruction of the important markings on top.
The 1948 has much better and more clear markings compared to the one I bought last year. Obviously the Tula stars on 1946 and 1948 are very different. And the ways СКС (SKS) were cut are also different.