Quick 91/30 question

I was at the range today and I whooped out my recently acquired 91/30. There was a man at the range shooting next to me that had a variety of Mosins, so I invited him over to check mine out. He mentioned to me that the dual year stamp on the top was very unusual. It reads 1942/48. There is no text difference in the stamp, they appear to have been made by the same set of stamps. He told me to ask someone who might know a little bit more about it because he thinks this might be somewhat significant. Any ideas?