Silver spoon loft find, worth anything?

[cyber69]

Found a box that's been in the loft the last 20 odd years with about 15 spoons in it, all hallmarked and this is the largest and clearest of them I could take a picture of. If it's of any value I might take them all down to the local antique dealer for an appraisal.

Any idea how old it is judging by the hallmark?

 

[cyber69]

Using the link I think the spoon was made in 1798! any Lovejoy's on here that knows how much it's worth?