Thanks for posting John. The chart is the product of Luger forum members input. The original idea was suggested by Jan Still. The valuable input is from a number of members.
The nd means "not determined" This was used when the owner could not determine whether the old marking had been milled off by milling the whole area, or the marking welded over and then milled (or ground down) to the original level.
This is a work in progress and most of the corections noted are appropriate.
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