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Disabled American Veterans (DAV) 13¢ Franking

Following is an example of a DAV cover franked with thirteen cents postage.  The 13¢ rate period began December 31, 1975 and ended May 28, 1978.

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 four 3¢ Parkmans (Scott 1297, Krause-Minkus 693) and  one 1¢ Jefferson (Scott 1299, Krause-Minkus 634), this cover uses all tagged coil stamps.