Here's an 'unofficial farthing' token I purchased in a Dix Noonan Webb desktop auction,
my first experience buying anything through D-N-W.

It's not even a Conder Token, from 1841/0, normally outside my collecting interests.

But I became interested in the design, so bid £25, not expecting to actually win the item.
In addition, I didn't really notice the date and thought I was in a Conder Token group.

But it is interesting and reminds me a bit of our U.S. Civil War Tokens.

£25 was $62.97 including shipping, so better to win a group of coins and save on shipping.
That cost included the buyers premium.

Dr. John Stuart Knox conducted a few medically related  practices and issued tokens for them.

Neat piece, Larry. 

Would be funny to send a letter addressed to the good doctor at 39 Maxwell.....something about a terrible rash   Perhaps he could Rx some panacea.

Larry,
  That is one very nice coin that you have got there.

There is a catalogue on the 19th. Century Farthing currency tokens,but I am not sure if it has been reprinted at any time in the past 30 years.

I do have a few of the post-1820 1/4d. ones,including 3 from Ireland.

The last currency tokens to be put into circulation in the British Isles was Professor Holloway's 1/2d. & 1d. from London dated 1857 & 1858.Professor Holloway's 1/2d. & 1d. turn up in large numbers in both Australia & New Zealand as well.

A few traders in England & Ireland did have currency tokens in the 1860's,but they were not put into circulation in the British Isles,but exported to Australia,which also had a coin shortage & an extensive currency token series in circulation,as did New Zealand.

Aidan.