Assuming that the gun has all matching parts, at 80% it is still in the "collectable" class, as opposed to the "shooter" class, in my opinion.
Although the specifications called for stock lugs to be added in late 1913, most of that year's production continued without this modification, probably because of the number of parts on hand. Some of the DWMs were made with stock lugs, and I have one in that category, but mine is SN42xx-b, the "b" suffix indicating that it was manufactured in the 24,000 unit area . . . . much later in the year than your example.
Jan Still's book, "Imperial Lugers," states that approximately 35,000 units were manufactured in 1913 by DWM, and his list of examples runs from SN2617 to SN315e. So, your example is earlier than any of those examined by Jan in preparing the book.
If you plan to keep it as a collectable, watch eBay for auctions of appropriate wood bottom magazines. They usually go for $75.00 to $150.00, depending on quality. Also, Tom Heller, "lugerdoc," on this forum sometimes has a few in stock.