Lot
4163 S
Postal Card, 1885, 1¢ brown on buff, Production Strength Sample, card with violet "Postal Card Agency, Castleton, N.Y., Feb 5 1886" three-line handstamp and with 70mm diameter strength testing circle broken and pencil "74" on face for pounds of pressure at bursting point, Very Fine. Scott No. UX8PS. USPCC No. S7PSg $600.
The strength testing cards are also known with "55" and "77" pounds of pressure at bursting point.
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Realized: $375