Antedating of 'offbrand' (1929)

[Sam Clements]

DARE has 1960, according to HDAS.
M-W has 1946.  OED is working on it.

1929 _Reno Evening Gazette_ 20 Aug. 12/8(newspaperarchive) "The best part of
it all is that you can buy these famous brands of food products at prices as
low, in most cases, as many grocers charge for unfamiliar, unknown,
off-brand(not sure if hyphenated...on two lines-ed.)  products."

Sam Clements