The Cambridgeshire Regt did exist after 1942 - serveral thousand cap badges were made in economy plastic in 1944 for the regiment. There is a very good article on plastic badges which lists all the rpoduction numbers and dates. As regards what is an original badge, in my opinion it is one that was made contempory to the period of wear - there is much restriking and lots of new dies have been made but these are all fakes in the purest sense. Alan