Patrick
I have observed both the “J” and “I” used interchangeable by the same Imperial Infanterie Regiment. See the three front strap photographs below. The top two are from a 1908 DWM and a 1908 Commercial Army; the bottom one is from a 1917 LP08.
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Some late World War I unit stampings vary considerable from regulations. Some rules of thumb based on over 800 observed and reported Luger markings follow:
J.R. or I.R. sometimes replaces R. in Infantry Regiment markings.
R.J.R. or R.I.R. sometimes replaces script R in Reserve Infantry Regiment markings.
After 1915, K. (kompagnie) sometimes follows M.G. or sometimes follows the kompagnie number.
Rarely C. (Compagnie, old usage) replaces K (kompagnie)
N.(number) or P.(pistole) sometimes precedes the weapons number.
Have not observed an “I” substituting for a “J” in a valid Jager unit marking. The (below) Imperial Jager Bataillon unit markings mostly follow the markings regulations (Gortz page 23), use a “J”, and are straight forward to identify using the regulations.
* 1913 ERFURT, s/n 4632a : 6.J.2.8. - (6 Jäger-Bataillon, Kompagnie 2, Waffe Nr. 8)
* 1913 ERFURT, s/n 4067 : 8.J.2.7. - (8 Jäger-Bataillon, Kompagnie 2, Waffe Nr. 7)
* 1908 DWM, s/n 7872 : 9.J.1.2. - (9 Jäger-Bataillon, Kompagnie 1, Waffe Nr. 2)
* 1910 DWM, s/n 5179b : J.B.12.1.12. - (12 Jäger-Bataillon, Kompagnie 1, Waffe Nr. 12)
* 1908 DWM, s/n 3732b : 13.J.1.1. - (13 Jäger-Bataillon, Kompagnie 1, Waffe Nr. 1)
* 1916 DWM?, s/n 3734b: 13.J.M.G. - (Jäger-Bataillon 13, Maschinengewehr-Kompagnie) A recording error with the 1916 Erfurt below?
* 1916 ERFURT?, s/n 3734b: 13.J.M.G. - (Jäger-Bataillon 13, Maschinengewehr-Kompagnie)
* 1915 DWM, s/n unk : 26.Res.Jäg.Batln. - (26 Reserve-Jäger-Bataillon )
* 1916 ERFURT, s/n 102 : Bay.Res.Jäg.Batl.2.33. - (Bayerisches Reserve-Jäger-Bataillon 2, Stab, Waffe Nr. 33)
* 1913 DWM, s/n 4735 : B.2.J. - (Bayerisches 2 Jäger-Bataillon )
* 1913 ERFURT, s/n 5763: G.J.M.G.12. - (Garde Jäger-Bataillon, Maschinengewehr-Kompagnie, Waffe Nr. 12)
* 1913 ERFURT, s/n 6396: J.3.M.G.23. - (3. Jäger-Bataillon, Maschinengewehr-Kompagnie, Waffe Nr. 23)
* 1911 ERFURT, s/n 6616: 8.J.M.G.13. - (8 Jäger-Bataillon Maschinengewehr-Kompagnie, Waffe Nr. 13)
* 1913 ERFURT, 1227a: 10.J.M.G.22. - (10 Jäger-Bataillon, Maschinengewehr-Kompagnie, Waffe Nr. 22)
* 1913 ERFURT, s/n 2153a: 11.J.M.G.49. - (11 Jäger-Bataillon, Maschinengewehr-Kompagnie, Waffe Nr. 49)
Jan