philatelia
Member
Captain Jack - my best kiloware find ever!
Posts: 3,622
What I collect: Ireland, Japan, Scandy, USA, Venezuela, Vatican, Bermuda, Austria
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Post by philatelia on Jun 29, 2024 11:28:10 GMT
USA Scott number C64a - An August 1, 1963 first day cancelled block stating “First Day of Use Luminescent Tagging”. These issues glow a bright red/orange under shortwave UV. According to Scott, these were first tested in Dayton, Ohio in 1964 using high speed sorting automation. ![](https://tsfimagehost.net/images/2024/06/29/58d0df8be4c6c438a7007ad5997c47c7.jpg)
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