The British prismatic fluid compasses are of high quality and therefor quite expensive. ( Between 200 - 300 euro)
SIRS Navigation (the successor of WF Stanley) and Pyser-SGI (the two remaining manufacturers) are located in Kent, near London. SIRS calls their compass the Model G150 Prismatic Marching Compass and Pyser-SGI calls theirs the M-73 or M-88 (aluminium version). They’re identical to each other in terms of design and features, including sight readings down to1/4 degree under ideal conditions. The MK III successors have five tritium light sources. These lights last for about 10 to 12 years. Every component of the G 150/ M-73 can still be replaced.
The serial# and the NSN have been removed. Probably this compass was stolen.
The scale is in Mils 6400/1000.