Welcome to the NOTECANNONS section of the MM FORUM. This is the forum for www.notecannons.com - a website hosted by Colin McCubbin that is dedicated to history of National, Dobro, Supro, and all things Dopyera related.
Hi Colin I think you're absolutely correct - it is a Japanese made banjo marketed by Strum & Drum in Illinois. These were first sold in 1971 under the 'Norma' name ( advert included). 'National', their other brand name was used for it the year after. So, not really knowing much about their serial numbers, I would guess this was around in 1972 or a bit later.