Starting in the 1950s I've seen a lot of them. Once I began to notice the patches in the toe, I deliberately made a habit of looking for them which I still do today. I deliberately looked into the OP's holster when he showed it to me and saw the one still in the toe of his.
I do not remember ever finding one oil soaked from anything, let alone excess oil running from a barrel.
In basic training in the early 1950s I was taught to put nothing more than a light coat (with emphasis on light) of oil on a weapon. Excess oil can freeze in the winter, and it always attracts dirt and sand. I can't think the German's didn't follow this simple logic.
Jack
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