Part 51
51.ni
Nickel plated, two flanges ¹
51.bg
Blue with gold crosshatching
51.nb
Plain blue (very late pre-war finish)
51.ma
Olive green, fewer holes in plates
51.mr
Medium red, post-war stamping
51.lr
Light red
51.bk
Black
51.bl
Blue
51.am
Olive green (Army multikit)
51.ye
Yellow (Crane/Highway multikit)
51.wh
White (Space)
51.dy
Dark yellow
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