What would be the reason for cancelling on the back? Is it considered a CTO? For such a heavy cancel it is surprising it did not bleed through to the front.
It could be for accounting purposes . Large quantity of bogus overprints existed with these air mail issues.It could be the postal authorities marked the genuine types for sale in the post offices....
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Posted 02/28/2021 08:14 am
Newly listed items on eBay by wheelman. 
SUDAN SCOTT 112113 USED 1183
SOUTH VIETNAM SCOTT B2 MNH 1182
USA SCOTT E13 MNH PERF 11 REALLY NICE EXAMPLE 1181
USA SCOTT RW15 USED 1179
USA SCOTT RW19 USED 1178
