Part 20b
20b.br1) Brass, deep rim for GRB. 31/32'' overall diameter | 20b.br2 Brass, standard rim for outfits, 3/4'' overall diameter | 20b.nb) Steel face, enamelled blue | 20b.re) As above but red |
20b.ni) Nickel-plated, pre-war stamping | 20b.br) Plain brass casting, post-war | 20b.bk †.',400,224,'white')) One-part alloy casting, painted black (Korean) † | 20b.bm) One-part alloy casting, matt brass plated, boss attached |
20b.bm1) One-part alloy casting, matt brass plated including boss | 20b.zn) One-part alloy casting, zinc | 20b.ir) One-part alloy casting, iridescent |
