Cachet Maker Chester Knowlson
Cachets should be listed in chronological order based on earliest known usage. Use
the postmark date or best guess. This applies to add-on cachets as well.
| Thumbnail Link To Cachet Close-Up Image | Thumbnail Link To Full Cover Front Image | Thumbnail Link To Postmark or Back Image | Primary Date Postmark Type Killer Bar Text Ship --------- Category |
|---|
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1931-03-03 |
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Last Day of Commission |
Close-up view of R/S address on the back of the March 3 1931 cover
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1931-03-03 |
|
Last Day of Commission |
Note:
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1939-04-21 |
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Registered postmark on a |
Note: Look carefully in the upper left corner for Chester Knowlson's return address stamp
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