As you have probably figured out by now, you have the 1952 version of the I-177, made for the US Army. Clearly it was obsolete at the time, but when the US went to war in Korea, we basically fought with World War 2 surplus. And sometimes the military found out that they had sold off needed things in the late 1940s, and had to reorder them (at great expense, mind you).
I sold the MX-949/U adapter a long time ago. I do not miss it - they are a pain to use.
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Will
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