• Perforation & Watermark

Perforation Gauge

This slotted gauge measures stamp perforations from Perf. 7 to Perf. 16 ½ and contains both inch and millimeter scales. Rugged metal construction. More...

Watermark Detector Tray

Constructed of rigid, impact-resistant black plastic, the tray's shallow sides permit close inspection of stamps. More...

Clarity Watermark Fluid

A product designed specifically for collectors. Clarity Watermark Fluid is a true innovation in the technology of expertising stamps, combining the clearest possible watermark images with safety for the stamps and the collector.
Clarity is the only watermarking fluid that was developed under the guidance and with the cooperation of the American Philatelic Society. Clarity is non-flammable, non-toxic, and is completely safe for the environment.
Available in a 3.4 fluid ounce (100 ml) convenient flip-top bottle.