25.mm
Feather key fixing, 25t x ¼'' & 20t x 7/32'' | 25.mm1
Feather & tongue key, otherwise as above | 25.mm2
Tongue key fixing, 25t x ¼'' & 20t x 7/32'' | 25.mm3
Tongue key fixing, now ¼'' wide |
25.br1
Single-tapped boss, 25 and 20 teeth | 25.br1a
Single-tapped boss, 3/16'' face | 25.br1
Single-tapped, pre-war 25 and 19 teeth | 25.br2
Double-tapped, pre-war 25 and 19 teeth |
25.br
Double-tapped, post-war markings |