6.mm
 Tinplate with rolled edges | 6.ti
 Tinned steel | 6.st
 Bright steel | 6.ni
 Nickel plated steel |
6.dg
 Dark green | 6.mg1
 Medium green (pre-war) | 6.go
 Gold | 6.mg
 Medium green |
6.lg
 Light green | 6.si
 Silver painted | 6.ni1
 Nickel plated | 6.zn
 Zinc plated |
6.zn1
 Zinc plated, five holes | 6.db
 Dark blue | 6.re
 Red (Dynamic sets) |