Serbia. (Serbian Bulgarian Boundary Commission). 1921. Envelope written from 'Lt. Col. F. Giles, of the British Delegation, Serbian-Bulgarian Boundary Commission' addressed to Wales with oval 'British Delegation/ Serbo-Bulgarian Boundary Commission/ Ref No' in violet on face, sent via Diplomatic Bag bearing Great Britain SG 368, 2d orange tied by London double ring '29/8'. Very rare item of mail from the British Commissioner during the Balkan Campaign.