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			What you have is a 1908 Pattern Large Pack.  B20340 was the Regimental Number allotted to the 46th Light AA Battery, RCA and M.D. 2 was Militia District 2.   I am not sure what SCU 484 stood for.   If you Google Canadian Militia Districts and 46th Light AA Battery RCA you will be able to find out more details about each.
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