slang. [According to Slang Dict., from Danubian-Gipsy cuta gold coin.] A sovereign.
1846. R. L. Snowden, Magistr. Assist., 346. I got six Finnips and a Cooter for the Yacks.
1851. Mayhew, Lond. Labour, I. 312/1. Upon which the swells come down with a couter (sovereign).
1880. J. Payn, Confid. Agent, I. 207 (Farmer). Well, he gave us half a couter at all events.