But Alyattes had been making coins out of electrum, a naturally occurring gold-and-silver alloy that often has bits of other metals in it. Alyattes' coins were standardized based on weight ...

Some of the coins were English silver groats, minted by both Henry V (ruled from 1413 to 1422) and Edward IV (ruled from roughly 1461 to 1483), while others were Scottish gold demy and half-demys ...