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Disabled American Veterans (DAV) 10¢ Franking

Following is an example of a DAV cover franked with ten cents postage.  The 10¢ rate period began March 2, 1974 and ended December 30, 1975.

Precisely dating these covers is very difficult as the covers are "mint" examples and do not have any cancellations.  I would very much appreciate any information/insights which could help to accurately date these covers. 

Franked with tagged dry print 2¢ Jeffersons (Scott 1055a, Krause-Minkus 588p1ssz), this cover uses a strip of five coil stamps.