这里有介绍
OATs & AV2s
OAT cachets were applied [almost] exclusively to airmail items that were to be expedited by air mail by ONWARD AIR TRANSMISSION. They are known during 1938 and 1970 and OAT's are most usually seen on World War II covers. AV2 cachets were used for essentially the same purpose. These markings owe their origin to the rules and procedures introduced under the UPU Convention and are civil markings even thought many items are known to have been carried on military aircraft.
Where there was a bundle of covers to be expedited only the top cover of the bundle was to be stamped.
For more information on this subject you should consult Murray Heifetz's OAT and AV2 Markings (now in its 2nd Edition), published by the AAMS, American Air Mail Society, where it is available for sale. |
发表于 2010-8-30 05:53
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