Need to ID pistol Magazine

I have a .25 cal. pistol mag that I'm 98% sure is for a Walther Model 1. It is identical in every way to the one pictured on page 121 in the NRA Firearms Assy. Guide (E.J. Hoffschmidt) except it does not have the checkered front edge on the floorplate. Rankin's Walther Volume III shows several later Model 1 pistols that do not have the checkering. I can email pics to anyone who might be able to positively ID the mag. Thanks very much, Jerry L.