Proof Block of Four 1c Proprietary, experimental trial color plate proof (R3TC), block of four, in Deep Blue on bond, still possessing a small portion of the varnish coating, large margins except clear to slightly in at top, very good-very fine , scarce, unlisted in Scott and Turner est.
Proof Block of Four 1c Proprietary, experimental trial color plate proof (R3TC), block of four, in Deep Blue on bond, still possessing a small portion of the varnish coating, large margins except clear to slightly in at top, very good-very fine , scarce, unlisted in Scott and Turner est.
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.jpg "Source: Christie's")
.jpg "Source: Christie's")
