Part 27a
27a.br1) Two holes, patent boss single-tapped 50/56t | 27a.ni) Thick steel face, nickel plated, patent boss 50/56t †¹ | 27a.ni1) Very thin steel face, nickel plated, flush boss 56t † | 27a.ni2) Very thin steel face, nickel plated, two holes 56t |
27a.ni2a) Thin steel, nickel plated, two holes 56t | 27a.ni3 Thin steel, nickel plated, no holes, offset teeth 56t | 27a.ni4 Thin steel, steel boss nickel plated, no holes, 56t | 27a.ni5) Thin steel, brass boss nickel plated, no holes, 56t |
| 27a.br2 Six holes, patent boss single-tapped 56t | 27a.br5) Eight holes, patent boss single-tapped 57t | 27a.br3) Brass disc and standard boss, 50/57t single-tapped | 27a.br4) Brass disc and standard boss, double-tapped |
27a.br) Brass disc, post-war stamping | 27a.bs †.',272,247,'white')) Steel disc, blackened (Korean) † | 27a.ye2) Yellow plastic ''Meccano England'', long brass pummel | 27a.ye) Yellow plastic ''Meccano England'', short brass pummel |
27a.ye1) Yellow plastic ''Meccano'' and bar, short brass pummel | 27a.bk) Black plastic ''Meccano'' and bar, short brass pummel |
