Two airmail covers, sent by husband and wife, from Newfoundland to the UK, and each franked with a single $1.25 sculpture booklet stamp, paying the correct $1.25 rate. One cover has the stamp with coloured tips at the top only while the other has them at the bottom only. Unitrade values any single international usage at $25, but I think that is a little high for the definitives. My estimate for these two covers is $15.
