Here's one of my plumes shillings (ex Rob)
I also like plumes, roses, R & P, S.S.C. etc, not just for the history, but because without them the designs remain completely unchanged for several reigns!
There is also the 1723-26 W.C.C. (bullion provided by the Welsh Copper Company) shillings (good luck finding / affording those in high grades!), EIC (East India Company, found on some George II gold coins), and elephant, or elephant and castle, (Charles II - William III gold and some silver, indicating that the bullion used in the manufacture of the coins came from Guinea in West Africa - which is how the Guinea 21/- coin came to be named).