Yeah, I'd assume that too. Esquires are often beautiful, and rarer than their Prestige counterparts. If Sidewinder were around this week, we could hear from the resident expert on that!
Barclay issued quite a number of Prestige albums in the late fifties, early sixties. At the time I thought their covers were a disgrace when compared to the original designs. Still dislike most of them. The US originals looked so much better (and were very hard to find even then).
Yes, 'Mobley's Message' did appear in the UK on Esquire. I remember seeing the cover art and it is different to the Prestige but don't have a pic I'm afraid. The Esquire was only in small quantities and is a rare one.