Hi,
Welcome to the Forum.
Richard Crossley & George Smith IV. This mark was entered at Goldsmiths' Hall on the 9th April 1807. The fact that it was struck with the dateletter 'L' that fell into disuse the following month, means that the date your spoon was assayed can be accurately given as between the period 9th April - 30th May 1807.
Some detail on Richard Crossley, or 'Charcoal Dick' as he was known, can be found at:
http://www.925-1000.com/forum/viewtopic ... 51&p=56398" onclick="window.open(this.href);return false;
Trev.