Neil and Jimmy,
you both bring up the interesting perspective of sales and marketing.
I remember reading a thread about "drummers" and salesmen, and specifically this post in that thread (Thanks Walt!)
Perhaps "rattler" was meant in the sense of a noisemaker or attention getter, and "rattler razors" are really like "drummers."
Or perhaps, Neil's observation of "rattling through" something (a beard) quickly lead to the name.
Getting closer? Maybe I'm just overthinking the whole thing. . .:banghead: :aargh: