4 1/2c The Hermitage (Andrew Jackson's home) Stamp (1959): How to Identify It

• Design subject: pictures a Greek Revival mansion, the Hermitage.
• Wet vs. dry printing: dry-printed examples can be told apart by whiter paper and a higher surface sheen.

The same design was issued in more than one form. Which one you have changes the catalog listing:

• Coil stamp, Scott 1059 (1959-05-01, Denver, CO): The coil version is perforated only on the horizontal edges instead of on all four sides like the sheet stamp.

• Measure the perforations with a gauge; the same design often exists in two or three gauges, and that is usually what separates the common one from the scarce one.
• Sheet, coil or booklet: coils have two straight edges on opposite sides; booklet panes have one or two straight edges from the pane edge.
• Tagging: hold it under a longwave UV lamp; tagged and untagged printings of the same design are listed separately.
• Condition (centering, gum, cancel) is a separate question from identification.

Lay the stamp flat on a dark background in daylight, fill the frame, and keep the phone parallel so the perforations are not distorted. Photograph the back too if there is a watermark or gum question. The app reads the design and denomination; the perforation and tagging checks above settle which listing it is.