Aha Trivia Stuff Everyone Should Know
Aha Trivia: Stuff Everyone Should Know · ahatrivia.com/mb-stamp-collecting-9cedf21b2507

What is letterlocking?

Folding and securing a letter to be its own envelope.

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  1. Folding and securing a letter to be its own envelope ✔
  2. Locking a stamp album with a key
  3. Sealing a stamp in plastic

Why: Letterlocking is folding and securing letter material so it becomes its own envelope or a tamper-evident lock.

Huh, didn't know that: Letterlocking is folding and securing letter material so it becomes its own envelope or a tamper-evident lock.

The dad joke
Letterlocking is a fold idea for keeping mail private.
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References

Answer: Folding and securing a letter to be its own envelope. Letterlocking is folding and securing letter material so it becomes its own envelope or a tamper-evident lock.

  1. Philately en.wikipedia.org/wiki/Philately
    folding and securing of letter substrates to become their own envelopes
    Checked 2026-11-07.

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