The MR1520 is actually on the cradle of the tripod. At this time I have not found a number on the baseplate. I'll sandblast it in the spring and see what comes up. In the last few weeks, I have seen photos of another 4.2 here in Canada with this same baseplate and managed to purchase a deactivated barrel for mine. Not knowing when to stop, I also purchased another 4.2 with a short barrel and tripod but no baseplate, and the sight collar is missing.
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