The 413C was made between 1947 and 1949 but this isn't the earliest model so it is likely this was made in 1948 or 49. Considered by some the best suitcase stove made by Coleman, the 413 series has a lot of fans, and that includes me. I also have a late 413E from 1961.
Thank you, apparently it was literally shipped across in a suitcase for the original owner by a friend visiting the UK from the US.