There is also the square trigger guard frame that went well into the 6904 and 6906. Same thing with the 3rd to 4th gen x39 to 39xx series and from the 559 to the 5906.
I have seen many 6904/6906 still with the square trigger guard but all else correct to the model number, then (when the square trigger guard frames ran out) stated with the newer round trigger guard. Same in the 5906/06 and 3904/06 models. Those seem plentiful.
The transition you refer to is a model marked 469 (669 too ?) with dovetail front and rear sights and ambidextrous safety ?
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ANTIQUESMITHS
LM1300 SWHF425
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