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<p>[QUOTE=&quot;lettow, post: 1087631, member: 6986&quot;]I am surprised that this information is not in Schwan&#039;s book since it is there for most of the series.&nbsp; The best we would be able to say is sometime in 1969.&nbsp; The first two numbers in the series number is the year they were printed.&nbsp; (This is in contrast to the year they were ordered.&nbsp; Series 471 was ordered in 1946 as Series 462.&nbsp; Since it was not printed until 1947, it was identified as Series 471.)</p><p><br /></p><p>Since Series 651 was issued in April 1969, Series 691 was probably printed in the early part of the year.&nbsp; DoD Regs required there to be two different series of MPC in reserve at any given time and it is probable that the new reserve series was printed prior to the release of series.</p><p><br /></p><p>Series 681 replaced Series 661 in August 1969 in Vietnam so Series 692 was probably printed middle to end of 1969 in order to have two series on reserve in 1969.</p><p><br /></p><p>Interestingly, if I remember correctly, Fred Schwan was in Vietnam when Series 692 was issued and wondered why it was not Series 691.&nbsp; He would not find the answer until sometime in the 1980s when researching for the catalog.[/QUOTE]</p><p><br /></p>

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