Came across this unit and it's un-identified in Writ in Steel. I have found that G.Tr. on page 2 is a rural police indentifaction mark, where exactly, don't know. I found this rural police bayonet with G.Tr. 6920 on it's crossguard. Not much but it's something.
http://oakleafmilitaria.com/0710ew3.html