Yes, nice catch of a first issue.
Hold opens were added in 1913; some '13s had none, and the hold open was added later; later in the year they were added at the factory as "standard". those with the hold open added will have a script letter near the hold open pin on the right side. So one can find three "different" types of 1913 pistols, those with No hold open, or original , or added hold open. A "collection" in a single year!
Your first issue would have had the hold open added in 1913 or later.