Gentlemen,
After looking at 32 Ithaca doubles I can say, I believe the Riddle is solved. Some time around the start of the 3rd type Crass frame, these stamps began appearing on both hammerless and NIG models. All my examples from 346xx (Crass) through 1879xx (Flues) has these stamps. It was not until I looked at the underside of the extractor itself that it clicked.
Answer solved,
John
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