Hi Ron & Murray,
* I'm certainly no expert on these; but, FWIW J. Walter,
The Luger Book, Pg.74 states: "The only visible differences between the two types of Borchardt lie in the sear-bar(slotted in the Loewe examples, solid in DWM) and the trigger-plate, the DWM version of which has less of a spur projecting above the trigger guard. The front of the DWM frame is slightly different from the Loewe type, though the differences are comparitively minor and could have been effected simply by filing."
* Other than the Loewe S/N range being 1-1100 and the DWM range being approximately 1101(S/N 1105 known)-3013(mag 3019 known), I wouldn't know what other item might be different to constitute the third item Ron has in mind. BTW-The date of the production/marking transition is reported to be 1 January, 1897 when Deutsche Metallpatronenfabrik became Deutsche Waffen und Munitionsfabriken (DWM) and Loewe tranferred "Borchardt" production to the new company.
* Why don't you two just loan me your two C/93's and I'll do a detailed study to find the differences!! Shouldn't take me much more than a lifetime or so.
* One beautiful cased treasure, Murray.
Success & happy hunting those few missing accessories. Keep you on your toes with the thrill of the hunt being half the reward.
Respectfully,
Bob