well, to me it's the sort of bar that someone who was originally in the Colonial troops and then went regular gendarmerie back home might have had. The Crown order is suspicious-as noted, BUT COs were gazetted in 1908-1917 to all sorts of criminal Detective types AND to Beamten of mid level and higher ranks. Some were even awarded for odd incidents like life saving or specific "incidents" or being Postal commissioner of some backwater outpost or honorary counsel somewhere.
The army/navy LS 15 is for enlisted men who served 15 years-(war time counted double-as did some overseas time/cruise time. These were commonly handed out in 1919-24.2 years overseas as a Colonial, 4 years in WW1 and 1919 gets you a 15 LS medal. Time served got fudged too into some other LS awards. I assume it did for the police LS.
The Luftschutz medal also is the sort of thing professional police got as "gas coordinators" in urban areas.
The metal backing and the french medal are suspicious.....BUT don't mistake me, there are so many things wrong with this bar that it's either been made by a complete novice/idiot or it's ok. "It's so ugly to me it's cute". The medals individually I reckon are worth @ 650 so why not?
I'd like to see the bars though and check the possibility of these awards.
Lots of warning flags- but the story is possible and so unusual I'd take a risk.