Wojtek,
can I please ask when do you think the veterinary officials had a helmet without the FR? The AKO of 19 January 1863 already ordered these officials to wear a shield with the FR on the helmet. The Zahlmeister, similarly had the FR since 15 March 1854.
A couple of interesting orders are translated below for further clarification of the types of helmet worn by various branches of the military administration:
AKO of 31 July 1860: " As a supplement to my order of 10 May this year, I order that the motto "Mit Gott für König und Vaterland" is also to be worn on the helmets of all those military officials serving in troop units" (i.e. at time the Zahlmeister and later the veterinary officials).
War Ministry instruction of 25 July 1869: "The question has arisen, as to which type of helmet justice officials, Intendantur officials, as well as civil and field officials of the military administration are to use. To remove this doubt, it is to note that those officials not serving with troop units wear the old model with rear peak, cruciform spike base and square front peak."
Regards
Glenn