The L & W are Lee & Wigfull. The "S" is for Sheffield. The EP is electroplate, silver over copper. I can't find a reference for the shield and the A or a date reference for when these hallmarks were used. The partnership of L&W dissolved in 1870 with one of the partners continuing under a slightly different insigna. Doubt this could have been on the ship from 1800 as ages of partners logically would preclude this. I will let you know if I can identify any of the other marks.
Edited to add: Can you give me a blow up of the shield part, so I can see if I can identify the symbol in there. I have another site that I may be able to get closer on the date. The shield area may identify the duty mark and then the A style will give me the year.
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