RE: Does Baldwins sell / trade Bitcoin?13 Jan 2021 11:22
You don't say, they've also been used on a multitude a sensitive document for decades.
You'll find they are/were used on cheques, remember those, bearer bonds, remember those, share certificate, remember those....it's pretty old technology and last time I was involved in them they were just fraction of a pence. Even your humble medical prescription has/had built in security devices, remember those. The base paper provided by limited mills, inks had "markers" - chemical & radioactive....holograms are more for show than security. In fact, most stamps have less security features than your average commercial cheque.
They were only issued in physical format as a gimmick, the whole point of bitcoins is they are a mechanism of transfer and scarcity. There's a much easier option if you require non-state issued "in the hand" currency, silver and gold rounds.
Are you sure you are a collector ?you seem to know so little knowledge about Government issued secure papers? Maybe a bit specialist for your average stamp buff. Stamps, remember those....modern concept in comparison to cheques and bearers.