Stampless 'FREE ON ACTIVE SERVICE' cover with circular 'ICS CONSTRUCTION COMPANY GREF' cachet in violet with F.P.O. No. 658 cds on reverse dated 24.1.1971. Addressed to 'HQ DGBR Kashmir House DHQ, P.O. New Delhi 11'. The GREF was heavily involved in protecting India's borders during the 1971 India-Pakistan War.