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ALT Impossible Post secondary market, 21 August–22 October 2026: USD 1,680 volume, 363 transactions, 47 sellers, highest seller revenue USD 370; Bindaro accounts for 99% of volume.
ALT Cream-coloured digital stamp block labelled “ŚWIT”, with a lone European bison beside water and the cathedral complex at Frombork. Planetary orbits surround a golden sun bearing the PZKF emblem. A white-and-red ribbon crosses the scene. Astronomical instruments, oak branches and red folk embroidery motifs decorate the border. The design is captioned “the courage to change” and commemorates the 6th PZKF gathering in Hajnówka, October 2026.
ALT Cream-coloured digital stamp block labelled “MOST”. Two people meet on a stone bridge decorated with a white-and-red ribbon, while two European bison drink from the river below. The PZKF emblem appears on the bridge. Letters, books, a globe, oak branches and red embroidery motifs surround the scene. The design is captioned “beyond divisions” and commemorates the 6th PZKF gathering in Hajnówka, October 2026.
ALT Cream-coloured digital stamp block labelled “DAR”. A laboratory table holds glass vessels, an open book and a scientific instrument beneath a glass dome. Pale blue light rises from a bowl towards the PZKF emblem. A small bison figurine stands on a windowsill overlooking a stylised Warsaw skyline. Oak branches and red embroidery motifs frame the scene. The design is captioned “altruism” and commemorates the 6th PZKF gathering in Hajnówka, October 2026.
ALT Cream-coloured digital stamp block labelled “KRYSZTAŁ”. A tall silver silicon crystal wrapped in a white-and-red ribbon rises from a glowing crucible. A round silicon wafer bears the PZKF emblem. A herd of European bison crosses a landscape patterned with circuit traces. Machinery, oak branches and red embroidery motifs frame the scene. The design is captioned “technology and progress” and commemorates the 6th PZKF gathering in Hajnówka, October 2026.
ALT Samotnik digital stamp: a lone European bison in woodland, with an engraving-style illustration and red folk ornament.
ALT Bison Bonasus sheet showing all four stamp designs, surrounded by forest illustrations, red folk ornament and a small railway scene.
ALT Matching Impossible Post envelope design with a European bison and oak leaves on the left and address lines on the right.
ALT Matching postcard address side with red folk ornament, a faint bison illustration, writing space and address lines.
ALT Samotnik — samotny żubr w lesie.
ALT Para — żubr i żubrzyca na tle zabudowań.
ALT Rodzina — dwa dorosłe żubry z cielęciem.
ALT Stado — grupa żubrów przy stogach siana.
ALT Black-and-gold English BINDARO infographic celebrating 10,000+ Impossible Post stamps. Snapshot: 9 October 2026. Total: 10,027 stamps, 39 designs, 133 collectors, since 20 August 2026. Five stamp illustrations represent Fungi (1,507), Vehicula (3,193), Ambulacrum (3,438), Testudines (132) and Inventa (1,757). Statistics: 1,842 letters sent, 1,766 envelopes received, 796 first-day covers, 382 envelopes forwarded, 225 fusions involving 1,789 stamps, 242 rare variants comprising 132 errata and 110 watermarks, and 260 marketplace trades. Record day: 8 October 2026, with 1,665 stamps minted.
ALT Square black and gold World Post Day poster dated 9 October 2026, headed “Big ideas. Small stamps.” It announces the Inventa · Europae open mint at 20:42 Polish time, CEST. Five illustrated stamp designs show Ignacy Łukasiewicz’s kerosene lamp, a Swiss officer’s knife, the Lumière brothers’ Cinématographe, Slavoljub Penkala’s automatic pencil and Viktor Kaplan’s water turbine. The poster identifies this as Impossible Post, Issue IV, from Bindaro.io.
