Museum conservators use Connolly's and Peccards, and of the two Connolly's is vastly superior. Peccards is a waterproofing compound containing hydrocarbons (good for field boots but not all that good for preservation). A lot of the older holsters you see with a white coating is the result of a too heavy application of Peccards that eventually oxidizes and looks really lousy.
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If it's made after 1918...it's a reproduction
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