i would bet ML-13 is a plant or department number
the photo does not look as early as 1890's i am guessing its a small negative that was contact printed or an image straight to positive photo paper and then typed on as part of a system designed for making badges -
maybe 1930's - 1940's give or take a few years - possibly even war time for security reasons
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"If there is a heaven it must have thinning aspen gold, and flighting woodcock, and a bird dog" GBE
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