Question about grips on 1916 Erfurt

[joncon]

I have a 1916 Erfurt, all numbers match including the mag. Except the grips. The right has what looks like a v and the left has a 2. They have a gap at the lower back. See pictures. The frame is a lot thinner there than my other Luger's, although none are Erfurt but this one. Are all 1916 Erfurt's this thin? Have my grips shrunk? They seem to fit my BYF42 OK and the black grips off my BYF fit the Erfurt.