Stamp perforation gauge

The importance of measuring stamp perforation in determining value

Measuring the perforation of stamps (or what is popularly known as "scarving") is one of the most important tests collectors use to distinguish rare stamps from common ones. Often, the same image and denomination are issued with different perforations; for example, you might find one stamp with an 11-inch perforation and another with a 12.5-inch perforation, and the price difference between them can be substantial.

Professional stamp perforation (scarving) measurement system

Precise 1:1 optical calibration with a realistic working area

1. Screen calibration (essential step):

Move the slider until the rectangle below matches the size of a real bank card placed on your screen:

Reference card size (85.6mm)

Calibration and start-up

Upload a picture of the stamp:

Perf: 11.5

Workspace (gray area) = Actual bank card size:

Zoom in (+) Diminutive (-) Rotation

📋 How to use it:

• Upload a picture of the stamp, then use (+) and (-) To match its actual size.
• Drag the red scale over the edge of the stamp.
• Move the slider Perf So that the lines match the holes.

🖥️ Note: On mobile, you may need to move the workspace left and right if the calibration size is larger than your screen.

How does a stamp perforation (screwing) gauge work?

The universal measurement system is based on counting the number of holes located at a distance of 2 centimeters.

Tips for obtaining the most accurate digital measurement:

1. Calibration: Make sure the bank card size on the screen matches your actual card to ensure 1:1 accuracy.

2. Lighting: When photographing the stamp to lift it onto the tool, use a dark background to make the holes (screws) stand out clearly.

3. Comparison: Place the red lines exactly in the middle of the holes, not on their edges.

You can also learn about How to examine postage stamps with a magnifying glass