We had a stamping bonanza up here in Canada about a decade ago (but mostly for non-circulating $1 & $2 banknotes). Dealers, or
ebay sellers, started to stamp our 1867-1967 Centennial $1 (which booked for about $2.50 CDN at the time) with a golden-inked maple leaf & sold them as "gold" Centennial collector items (for $5).

Unfortunately for a few unsuspecting collectors, this defaced banknote's popularity grew, and they started selling fast. Before collectors from CPMF
https://cdnpapermoney.com/forum/ or the community could set them straight, some of the last $2.00 banknotes stamped with a polar bear started being sold on
ebay too.

Anyway, eventually collectors got the word out & the furor over these rubber-stamped notes died down. However, the downside is that a few unsuspecting collectors got "burned" with the stamped (defaced/devalued) banknotes. It is one of the reasons I get upset over some of the novelty items I see. But it is great to see this thread & I hope it keeps collectors vigilant about what to collect.
