The reverse with 5TH SEP 1811 and WALES AND BRISTOL as you describe, is only listed with the building type, as number D5 or D6 under MERTHYR (Glamorganshire) in Daltons 'The silver Token Coinage 1811-12'. Under Bristol the Prince of Wales obverse occurs on number D37. So, you've got one with a Britsol listed Prince of Wales plume side, and a Glamorganshire listed text side.....Which doesn't mean it's rare, I'm sure they swapped dies around just for the sake of it, and as Dalton was originally written in 1922, there may well have been new discoveries since. PM me and I'll email you the email address of Dr Sriro, Conder expert.