Thanks to all for the responses and the help. The strings did indeed come in a clear plastic envelope (perhaps it is the full set that comes in a red package?), with the top string labelled 101. I mistakenly thought that the envelope was sealed, instead of the flap being folded into the throat. Having purchased the strings from Ostrie Music, I wrote to Bill, with whom I have exchanged emails in the past and with whom it is indeed a pleasure to deal. Bill assured me that nothing was wrong: that the strings were the 100p set and are labelled by Mari as “101, 102, and so on” (as you indicate, Keith, they are labelled 101, 102, 103). So I opened them and they were labelled 101, 102, and – 3rd. Hmmm. The confusion at 3 p.m. on Friday when packers are thinking about the weekend? Probably. But – another letter to Bill. To be on the safe side. I’ll let you know what I learn when he responds.