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Aluminium frame was also suspicious to me.
But I know C. Plath did use aluninium frame,
though I am not sure in which years.
(It seems to me that aluminium frames were
introduced in 1930-s by Hezzanith. More
precisely they were "Duralumin" frames,
as the one on the SNO-T. Duralumin is a hard
aluminium aloy used in aircraft industry).
On Tue, 9 Nov 2004, Fred Hebard wrote:
> The EBay listing cites an aluminum frame, which I'm not sure C. Plath
> ever used, or, if they did, up in the 60s.
