set of 6 spoons old unidentifiable date letter

[ag93]

Have looked through my hallmarks book but no date letters link with this mark?

http://www.flickr.com/photos/79921151@N07/8009964430/in/photostream/

http://www.flickr.com/photos/79921151@N07/8009966786/in/photostream/

I think the letter is a fancy d

[spobby]

London 1856 .. I would think it's the 'a' of that period
Regards
John