That first brochure image that Jack has put up is most definitely an early to mid 1976 brochure as it sports the then newly appointed Pentagon Logo, but still utilising the Kirby which was replaced with the B&S engine line up later in 76.
Cheers, BB.
I live a 24 Hour lifestyle, but every now and again I seem to fall asleep, well at least that's what my wife tells me.