I'd guess more like the 50's-60's,, many of these early kits were Made in Japan and imported under many different labels, the Manufacturer's' names were intentionally left off the plans/kit boxes, "Made in Japan" didn't go over well with many Americans of the Time until the mid-late 70's when Cars and TVs etc started be accepted. Not many new U-control kits introduced in the 70's Little lone the 80's anyway with the exception of a couple Goldberg and Midwest kits