10c-20c 1888-1925 Special Delivery, "Specimen" Ovpts. (E2S, E6S, E12S-E14S).
Unused (no gum), E12 with blue crayon "check" mark, few small faults, Fine-Very Fine and rare group showing the running messenger, bicycle messenger, motorcycle messenger and post office truck delivery designs, each with 1977 B.P.A. certificate
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