Physical description
This nose cap is in 2 sections. The pointy end is aluminium and the base section is heavy brass. There is a threaded base. On the brass section are three rings. These tapered rings have holes and slots for tools. The very bottom ring has fine graduations marked ) 0 - 30.
The bottom, underside, of the base has a round red plate. It has 3 holes. the centre hole looks like it has had a "burnout".
Inscriptions & markings
The middle ring has "NR11" marked on it.
The nose cap has "390 MK-2A".
