Hello all Xacto knife/tool fans.

I'm looking for information about the following number Xacto blades:

#'s 1, 3, 5, 6, 20, and 21.

Seems they should exist, but I can find no information about them.
Most likely discontinued before 1949 as I can find no info in the posted catalogues from 1949 on up. Possibly pre WWII. We know Xacto existed pre WWII, but have found no catalogues / info so far prior to 1949
Thanks !
GH.

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