The abstract came back from 1946, and the numbers line up appropriately for movement and SN.
I actually believe the buckle to be original, not because of my personal knowledge, because when I picked up my watch from the boutique after service/restoration they were kind enough to put a similar 4240 from 1945 next to the 4241. They had identical buckles. It is possible that they put a later buckle on the 4240, but seems unlikely that they would be identical. Also, I have a significant amount of experience dealing with antique leather and restoration. I can promise that the band is much older than the 80's, and it clearly had not been swapped in a very long time, judging by the amount of gunk that was inside the pins...etc. I agree that the band is most probably not original given that it is not branded VC. Also, the pictures are difficult to tell but the clasp is rose gold.
The watch has since been restored by VC. I returned the watch for service/restoration/provenance, because VC would not refinish a watch incorrectly, and it seems like they produced these with many different dial variations. I wanted to make sure it was done correctly. They really did a great job with it! See attached pics next to the 4240 and with an updated band.

