Nah, no worries. It's the pipe hobby. Just when you think know something to be correct, there is still much to be learned. I've been schooled many times before.
No sweat. I'm glad no one was around the first dozen times I attempted to pronounce many a danish, german, italian, or russian pipe makers names out loud.
Pipepedia says it originated in 1986 and was then discontinued at a undetermined date. Then a small revival was issued in 2006. But the White Spot page shows it is now once again available. So, technically, it is a new finish.
https://www.whitespotpipe.com/dunhill-county-pipes
I like Brian's suggestion that they ran out of the letter 'r' hence county and not country. However - and I have no evidence for this conjecture - in England the 'County Set' were/are typically the upper crust country set - the sort who wear hunting pinks (i.e. red coats) when fox hunting; attend summer balls and generally mix with the 'right sorts'. So perhaps calling it 'County' was an attempt at suggesting a superior range suitable for the upper echelons of society.
Of course my theory could be a load of codswallop in which case hopefully some will correct me!
It actually is the newest Dunhill finish though it is around 8 to 10 years old now. When new, it looks light tan and brown.
It almost looks like a cross between the Tanshell and the Cumberland so it appears that one was well smoked. The newer reddish finish is the Rubybark, which is like an update to the old redback.