More value, perhaps to a collector of lugers that is really into the "weeds" and minutiae!
I bought one but it was not at a premium; they are an interesting, known and legitimate variation.
Mine is a 1918 Erfurt, finished in 1920 and marked "1918/20".
It also is unit marked to the Weimar Army or" Reichswehr". Including "provisional" markings on the frame rear; by the time the front strap was marked this pistol became weapon number 5 instead of number 4.
Having read the thread referenced above, I've posted a few more pictures. The pistol still has the Erfurt accepted grips screws, which I suspect are later "enhancements", since they were not used by Erfurt after about 1916; I'm a little suspicious of the grips with all 3 digits, and of course the striker is mismatched; though the rest appears to be all original Erfurt work.
Curious indeed as first pointed out by Dwight back in 2004.
I would certainly add a 1917/18 to my collection if one popped up at a reasonable price.