I'm not exactly sure what this is - I think it's a sales tag that would have been attached to purchased typewriters, but I love the 'Low's' type it's great. The red disc is weighted and engraved on it's metal centre with, '3 in 1 velus quality. The world over. Made in England. N0.100' on both sides. There is a postage stamp on the reverse with a date of 15.06.35 so I'm guessing it originates around that time.