Thanks for looking.
I'm continuing the clear out of my motorcycle brochure collection and came across this slightly smaller than A4 sized 4 page brochure by Yamaha Motors NV detailing what I believe to be the first RD400, the RD400C (1976/77). This is a very rare copy, it has a Dutch feel to the main front photo, but the brochure is in English.
I'd describe this brochure as being in very good condition. Please look closely at the photos as they do form part of the description, and keep in mind it is over 45 years old.