Nice booklet Ken. The 2 3/4 h.p. Douglases we pretty old fashioned, so the EW was a big thing for Douglas, critical to sales and winning back customers. No doubt this little book was produced to try to win back old customers and gain some new by convincing the public of the modernity of the new EW. So yes, I'd call it a sales/promotional brochure, albeit a very fancy one.
Leon