Almost matches George III Guinea from United Kingdom, but these were in gold and all examples on numista show the portrait facing right, not left. I would search other territories and possession of the British Empire. Good luck and be sure to let us know what you find.
Not really a coin. Its a gaming token. My 1783 has MFETHREXFDBETLDSRIATETE on the reverse. Quite sure that is gibberish. 26mm
It's not gibberish, the genuine gold coins have very similar, just can't find a copper similar at this point https://www.britishmuseum.org/collection/object/C_1838-1203-5
This British Guinea has the legend "MBF...": Britain Guinea "spade" type 1794 Gold, 25 mm, 8.37 gm Obverse: George III facing right GEORGIVS III DEI GRATIA (George III, by the Grace of God) Reverse: Crowned arms of Britain, Ireland, France, and Hannover M.B.F.ET.H.REX.F.D.B.ET.L.D.S.R.I.A.T.ET.E 1794 M.B.F.ET.H.REX.F.D. is MAGNAE BRITANNIAE FRANCIAE ET HIBERNIAE REX FIDEI DEFENSOR King of Britain, France, and Ireland, Defender of the Faith B.ET.L.D. is BRVNSWICENSIS ET LVNEBVRGENSIS DVX Duke of Brunswick and Lueneburg S.R.I.A.T.ET.E is SACRI ROMANI IMPERII ARCHI THESAVRARIVS ET PRINCEPS ELECTOR Holy Roman Empire, Arch-Treasurer and Prince-Elector
Thank you! I knew it had meaning, but I wasn't sure where to find the information to help flesh out the meaning of the lettering of the coin.