Leaderboard

I believe that is an Evasion halfpenny rather than a token, and a pretty scarce one at that! It is listed in the Wither's Token book, Volume One, in the list of Evasions as Number 7 of 450. No die varieties are indicated, but with these unofficial (bordering on illegal) evasion issues, quality control would not have been their first concern and so numerous minor die variations are likely. I hope that helps.

The Large and small dates are well collected but anything outside that is a bit specialist

I suspect this is where you got the obverse 3f attribution: https://aboutfarthings.co.uk/catalogue/uk-farthings/victoria-1838-1901/victoria-young-head-1838-1859/1858-farthing/ That is the most comprehensive online resource on farthings that I am aware of. At the bottom of the page you will see he has 17 different combinations of varieties! However they all have a single Peck number. Farthings seem less sought after than Pennies and so the varieties are more of an interest than a serious collecting area for most. Because of this I don't think anyone has the data to assign scarcity measures to each variety. The About Farthings is not currently being maintained and so some pages are disrupted and the whole site may disappear one day.

https://www.colincooke.com/ccc_frontpage

I dabble mostly in silver coinage and I would concur, most of us are happy with one of each date. That said this might include some slight variants, perhaps overdates if well known or maybe 'small date'/'large date', 'Arabic 1/Roman I' types.

This is the correct link https://royalmintmuseum.collectionsindex.com/home