1910, 8c violet & black, Specimen overprint type A (Scott 34S A), a pristine block of 4, o.g., never hinged, Very Fine. Only 300 known.
Scott $100+. (Image)

Estimate $150-200

1921, 1¢-24¢ Pictorials, "SPECIMEN" overprints complete less the 50¢ (Scott 60S-65S), blocks of 4, o.g., never hinged, each with security punch, Very Fine.
Scott $840 for hinged singles. (Image)

Estimate $300-400

1924, Unissued 1b black, Specimen overprint type Ba (Scott 69 footnote), a choice block of 6, o.g., never hinged, otherwise Very Fine. Only 200 known.
Scott $270+. (Image)

Estimate $200-300

1907, 1c green & black, imperf between (Scott 22a), horizontal pair, o.g., hinged, Post Office fresh with clean paper and robust color; gum lightly toned; thin at bottom of position 1, Fine to Very Fine appearance, only 50 issued.
Scott $1,100. (Image)

Estimate $300-400

1907, 1c green & black, double overprint, one inverted (Scott 22f), the inverted overprint (reading up) is faint but unmistakable, o.g., lightly hinged, fresh and beautifully centered, Extremely Fine. Only about 20 examples are recorded.
Scott $1,750. (Image)

Estimate $1,000-1,500

1912, 2c vermilion & black, handmade booklet pane of 6, perforated margins (Scott 39g); top pair separated and rejoined, right perfs mostly clipped, as is frequently the case, Very Fine appearance.
Scott $900. (Image)

Estimate $200-300

1912, 2c vermilion & black, pre-printing paper fold (Scott 39 var.), top sheet margin vertical block of 10 with two small, slightly diagonal folds, one visibly affecting four stamps, the other affecting one, o.g., hinge remnants; bottom block of 4 rejoined, otherwise Very Fine. A nice specialist piece. (Image)

Estimate $200-300

1926, 5¢ dark blue, sharp "A", "CANAL" inverted (Scott 86b), o.g., lightly hinged, the left stamp in a horizontal pair with straight edge at the top as always; average centering, Very Good to Fine. Only about 30 examples are recorded.
Scott $950. (Image)

Estimate $300-400

Registration Envelope, 1918, 10¢ on 5c black & red on cream, narrow surcharge (Scott UF1), cut square, canceled with a small part of a Cristobal c.d.s.; light vertical crease, otherwise Very Fine, signed J.A. Fox.
Scott $2,000 for an entire. (Image)

Estimate $300-400

Postal Card, 1921, 1c green (Scott UX5), mint card; few tiny, light tone spots, Fine to Very Fine.
Scott $1,000. (Image)

Estimate $350-500