Hi SilverK,
At this period, there were two 'GH''s registered with the Sheffield Assay Office. George Hawley registered a 'GH' punch, with no pellet, on the 22nd January 1784, and George Hague registered a 'G.H' punch, with a base line pellet, on the 12th March 1798. Your pellet is centred (G·H) and matches no registered mark at Sheffield at this time that I can find.
The trefoil Duty mark, to my knowledge, was only used from July 1797 until May 1798, so both makers are candidates, but to me the lettering on George Hague's registered mark, more closely resembles the lettering on your example. It is quite likely that he had several punches and as the only other Sheffield entrant had none, the position of the pellet may not have seemed critical at the time.
There will almost certainly be full marking on these pieces, but the other marks will be on the tang.
See:
http://www.925-1000.com/forum/viewtopic.php?t=5545
and:
http://www.925-1000.com/forum/viewtopic ... 31&p=15531
Trev.