Was looking thru a photocopied 1955 price list and the double sided pencils with riveted-on clips were called “Double-end Model” or “Double-end Checking Pencil”. I wonder when they switched to calling them “Twinpoint 2000 series”? Autopoint Pricelist 1955.pdf (5.8 MB)
In the very broad sense, if you want to know anything about AUTOPOINT, search out Jonathon Veley. He and his father are perhaps the most expert on anything AUTOPOINT and Jon on most other things American mechanical pencils… from the “early” day on…and a very nice guy, to boot…