1694 Farthing Please Help Grade!

I would suggest a grade of Fine or thereabouts on the UK standard, if I can see accurately through the blur. The portraits are good but there is some lost detail in the obverse legend.
These coins always sell well as they are one of the few affordable ways to get a William & Mary portrait on a coin. If you look on Ebay you will find many for sale and sold. Ignoring the over-hopeful buy it now prices of some listings and concentrating on those that have already sold, I would think you would get around £50 to £60 for this there - depending on the view potential buyers take.
There are numerous minor varieties of this coin - I think yours counts as "single exergue line", which may make it more desirable to the collectors.

"It's a halfpenny, not a farthing."

So it is - I did not think to check the proportions. Doesn't actually change much else - price guide is still about right.

fine IMO