I have the one that we just pulled out of my KH, and they are the same number as the '52. Mine is real worn out, after 50 years of abuse, mostley atributed to me. Do you need a new one to mesure, or would you like me to send you my old one. You can send it back, so it can collect dust here when you are done, or you can keep it until you or I figure out someone that needs it for something. Might make a good key ring for the out house door?