AJS Matchless Trials Style Replica Rear Number Plate, similar to the original part.  Made from 22 SWG aluminium plate, it is 7.5 ins wide and 8.5 ins overall top to bottom and the top is shaped and drilled to fit a standard Lucas type L564 light.  The holes in the main plate are spaced to fit the standard AMC trials mudguard bracket.  I made 2 but this is a spare.