1972 2½p Scottish Regional, Edinburgh CDS

22nd September 1972 2 ½p Scottish Gum Arabic Regional with an Edinburgh CDS. Unaddressed Cotswold cover. £40 catalogue value.

Gum Arabic was the traditional gum used on GB stamps, which comes from the tropical acacia tree. The transition to polyvinyl alcohol (PVA) gum began in the late 1960s, with this regional issue one of the last instances where gum arabic was used before the complete transition to PVA.