Part 63
63.br1
Brass, only two transverse holes, single-tapped
63.zn
Grey zinc(?) alloy, only two transverse holes, single-tapped
63.br2
Brass, single-tapped (strip coupling double-tapped) ¹
63.br3
Brass, double-tapped, stamped (strip coupling cylindrical)
63.br
Brass, double-tapped, not stamped (post-war)
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