Here is an interesting cover I found. It has a complete set of both the second and third postage due issues (J6-11, J12-20). I believe it is a combination last day of use of the second dues and first day of the third dues, but I am not positive. The second dues are cancelled 11/28/52, and the third dues are cancelled 11/30/52. Anyway, it is an interesting cover I thought I would share.