Trident Overprints -Kharkiv. 1918, black overprint (type 1) on imperforated 1k-35k, complete set of six in horizontal pairs, all are postally used (4 - on pieces), mostly VF, Bulat #677-82, C.v. $217, Est. $100-$150 (Image)

Trident Overprints -Kharkiv. 1918, inverted black overprint (type 2) on imperforated 3.50r maroon and green in block of four, both left stamps without overprint, full OG, NH or LH (top stamps), VF, expertized by Dr. Seichter, Bulat #739g var, C.v. $120 as two pairs with and without upright overprint, Est. $100-$150 (Image)