1c 1861-68 Issue, Loewenberg, MacDonough and Wyckoff Re-Use Prevention Patents, Trial Color Plate Proofs on Wove (63TC5, 63TC6). 61 proofs in singles or multiples spread over the three patents utilized, each was an attempt to produce a stamp that could not be reused, includes Loewenberg block of four, six pairs and seven singles, all in a wide range of colors, MacDonough sheet margin block of eight, two blocks of four and a pair, Wyckoff two blocks of four, a pair and 11 singles, imperforate and perforated, each patent shows one item tested, choice condition

VERY FINE LARGE ASSEMBLAGE OF THESE FASCINATING 1860's ERA RE-USE PREVENTION PROOFS. RARELY SEEN WITH THIS DEGREE OF COMPLETION.

Loewenberg's patent (no. 42,207 dated April 5, 1864) involved printing on a starch coated wove paper, creating a barrier between the ink and the paper. Any attempt to wash off a cancellation would remove the design. MacDonough's patent (no. 52,869, dated Feb. 27, 1866) involved printing with a glycerin based soluble ink which would wash off when trying to remove a cancel. It only comes in the Brown color. Wyckoff's patent (no. 53,723 dated April 3, 1866) was a printing on wove paper that had been coated with a water-color pigment, "China White". Any attempt to remove or wash off a cancel would remove the stamp design. For a more extensive discussion of these essays see James E. Lee's Chronicle article (No. 209, pp. 40-43). Copies of the patent papers accompany.

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