7'th classicphil Auction - Day 2

1899, 1 s, green-blue, PIGEON POST 3rd issue with black PIGEONGRAM opt on complete flimsy, violet circle cancellation GREAT BARRIER/PIGEONGRAM SERVICE, it is written DEAR SIR/PROSPECTS IMPROVING. MINES FLOODED OUT. S H HOWIE, very attractive and desirable, XF! Estimate 12.000€.