Examples of the type
Private collection
1954 – G/N → P/N, R/N → Z/N, A/O → K/O, T/O → Z/O, A/Y → P/Y, R/Y → T/Y prefixes [CBN]Signatures: JRB, LRG/N → P/N, R/N → Z/N, A/O → K/O, T/O → Z/O, A/Y → P/Y, R/Y → T/Y prefixes [CBN]
1954 – G/N → P/N, R/N → Z/N, A/O → K/O, T/O → Z/O, A/Y → P/Y, R/Y → T/Y prefixes [CBN]Signatures: JRB, LRG/N → P/N, R/N → Z/N, A/O → K/O, T/O → Z/O, A/Y → P/Y, R/Y → T/Y prefixes [CBN]