Trident Overprints - Poltava. REMARKABLE UNIT OF TYPE: 1 1918, violet and black overprints on 80 perforated and imperforate mint and used (50%) stamps in singles, pairs strips and blocks of four, including 3 punched stamps (No.955 not counted), among better: two of 35k with violet and black, 70k with double black, imperfs of 15k and 10r with black overprints and more, occasional flaws possible, full/large part of OG or used, F/VF, C.v. is over $2,350, Est. $800-$900 (Image)

Trident Overprints - Poltava. 1918, violet overprint (type 1) on imperforate 50k brown violet and green, almost complete Poltava postal cancellation, VF, priced with ''-'' in the Cat., ex-Dr. Zelonka, Est. $150-$200 (Image)

Trident Overprints - Poltava. 1918, green overprint (type 1) and black overprint (type 2) on left and right stamps of perforated horizontal pair 20k blue and red, full OG, NH, VF and a spectacular item, ex-Dr. Zelonka, C.v. $525 for single stamps, Est. $300-$400 (Image)

Trident Overprints - Poltava. 1918, black overprint (type 2) over black surcharge 10k on 7k light blue, nice and fresh, full OG, LH, VF, expertized by Dr. Seichter and others, priced with ''-'' for unused stamp and $250 for used, Est. $150-$200 (Image)

Trident Overprints - Poltava. 1918, black overprint (type 2) on perforated 20k blue and carmine, full OG, NH, VF and rare, expertized by Dr. Seichter, priced with ''-'' on unused and $275 for used stamp, Est. $150-$200 (Image)

Trident Overprints - Poltava. 1918, black overprint (type 2) on perforated 1r, 3.50r and 5r, full OG, LH or previously hinged, VF, various expert's markings on reverse, C.v. $235 (Image)