There is a wonderful web site, AboutFarthings, that will tell you all you ever need to know about farthings. Probably more!
Catalog values for Edward farthings start around $1 US dollars for worn specimens, increase to $3 in average circulated condition, and end high at $30 for coins that are completely and fully uncirculated. The coin in our picture would probably catalog for $15. Use our Important Terminology link to understand what 'catalog' means.
The values above apply to all dates in this series of farthings, except dates 1904 and 1910, which are worth a tad more.