SUPRASL (Poland): 10 kopeck brown and blue, good to large margins, with sheet margin at right, tied by merchants handstamp "…SUPRASL" and in transit by boxed "BELOSTOK …", to lettersheet to Warsaw. The name in the address cut out, otherwise fine. The only recorded No.1-cover from this small village  one of very few entires recorded from todays Polish soil. Certificate Buchsbayew (2018)