Hi blakeyboy glad you like the thread. Yes the majority of the Encased Farthings surrounds were made of aluminium, although there are a few that have been encased in other metals. Take a look at this https://encasedfarthings.com/encased-farthings-reference-section/encased-farthings-f-to-g/generic-round/ from my Encased Farthings Website. I do find these fascinating. Since starting to collect these back in 2017 I have managed to build a nice collection. I have found that there does not seem to be many serious collectors of the British Encased Farthings. I only know of five serious collectors. Three within the UK, one in the USA and one in Canada. There are hundreds that collect the Encased Cents within the USA. The british examples did not seem to take off as well as there US examples. There are only around 70 different advertisers know to exist, there maybe others that have not come to light yet. That's why I built My Encased Farthings Website as a Reference for any new collectors out there that maybe interested in collecting them. I will keep adding to this thread as and when I get others. Or you can just visit the website for more information on these.