Those Mysterious Forty-fives

[Edward Tinker]

.... It shows once and for all that the 1907 field trials in which the .45 Luger competed did not utilize the .45 ACP round. ....

I sure don't agree with this statement; it may be convincing but I don't think many folks have held the .45's in their hands, let alone done measurements (except Mike Krause who made / makes 45 Lugers that were measured from the Aberman). I just don't think things are so B&W, but I will pull out my books and re-read those sections plus Meadows.

And from wikipedia 1mm is very small, 1.0 mm — 0.03937 inches or 5/127

And the brown grips were interspersed throughout the ranges, if armorer replacement, they could have been put on whatever was in service at the time, that means a WW1 gun could have them on it, and technically be correct, you would just never know unless a bring-back from someone you knew.