For the calibre in the 6562, I've provisionally used the information available on auction records compiled here: www.collectorsquare.com
i
The listings sometimes refer to both K1072/1 and K1072/T. Being none the wiser I chose one but once I have the serial and case numbers I should be able to verify the actual. Needless to say until then my grasp of such things is a little sketchy.