Princes Issue - Postal Stationery item

Lot number 2944 Quality: PWST

1909, postal stationery Stibbe #23P, "15c blue + 15c brown on sky blue - Prince 1909 issue" with typo overprint "CONGO BELGE" in black, cancelled to order "MATADI 30 SEPT 1909", rare, with Lindekens certificate, f

Lot number 2945 Quality: PWST

1909, postal stationery Stibbe #25P, "10c red-brown + 10c green on pink-lilac - Prince 1909 issue" with typo overprint "CONGO BELGE" in black, cancelled to order "MATADI 30 SEPT 1909", scarce, with Lindekens certificate, vf