I believe that the scroll R indicates a reserve unit.
The 1913 may have a factory hold open and a stock lug depending upon when it was made in 1913. The earlier ones had neither or possibly a factory hold open and no stock lug. The hold open was mandated in a May, 1913, directive while the stock lug was mandated in an August, 1913 directive. Thus I think it possible for a 1913 to have the factory hold open but no stock lug... but that is speculation on my part. I would think that if any were produced that way, they would be very few in number.
Basically I'm saying that the 1913 Lugers could possibly be found in the following configurations:
1. No factory hold open or stock lug
2. Factory hold open but no stock lug
3. Factory hold open and stock lug
4. Early 1913 Luger without factory hold open modified by the Erfurt Rifle Arsenal to have a hold open and new front sight
The only one I'm not certain of is number 2
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