South Africa 1915 International Reply Coupon, 3d

1915 INTERNATIONAL REPLY COUPON, 3d denomination, issued for use (sale in) the Union of South Africa. The subject example VF (pressed vertical fold not apparent to front) with Pretoria (place of sale) cds 29 APR 15. This coupon was intended for reply purposes for an ordinary letter from other UPU participant countries. Interesting.