with apologies to Ogden Nash...
I haven't seen one of those old type cores in so long I can't remember. I wonder, and I looked, when they changed over to the newer short core? Talk about a successful invention!
I see both styles (but I have no idea how old the tubes or stems are...) I just assumed there were several different designs in use concurrently.
I remember seeing the old long spring valves on 50-60's motorcycles and then slowly they got replaced with the short type. According to the web Schrader updated the design to the short type but doesn't say when. Probably 70's if I remember correctly. Man we need to memorize this info huh? Gonna need it one day:)
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