G'day gnomester
Yep, I think you have done your research there.
The '73 advertisement would be a good guide as to date.
Note the lack of a 'dress cowl' over the metal cowl.
This started to appear late 1960s.
I can't say too much is known about Bragg Industries.
They seem to have found a niche market for quality entry-level
lawnmowers - and catered to small dealers too.
Many thanks for the Kirby spec numbers.
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Jack