You are welcome! This is a semi-official Rail-air stamp. It was assign # 301 under Great Britain in Sanabria 1941. The serial number at upper left is correct out of 12000 printed. In 1941 value used or mint $4 on cover $25. it was 1st used on services between Cardiff & Plymouth. Stamp was issued on May 15, 1933. This was the 1st Air Mail stamp from the United Kingdom. There are 4 other Air stamp issuers from UK between 1933-39.
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