I'm not sure why they went from 1/4" to 3/8 low .Maybe the cutter is a little taller on the 3/8 and rolls a bigger chip .Then too with 1/4" you just take smaller bites but a lot more of them .
It was standard small saw size up perhaps until the late 70's I 'd guess .Afterwards it all went to 3/8 lo profile/pico .I've got a couple oldies with 1/4" chain .
Also I might note Oregon at one time made 1/4" chisel in both full and skip .It cut like crazy .It was taken off the market because...
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