Do you have the VIN number for it? I only ask because AFAIK, RHD production began in May 1973.
It's not the Sud I'm thinking of which was TOT813M, same colour blue.
Either way it's a superb find - did the owner bring it to show before he restored it, or was it for sale? Mine is a file of festering scrap and would need a bodyshell as the original was far, far beyond repair 15 years ago when I last clapped eyes on it! Front floors missing, inner wings actually breaking away from the knackered bulkhead resulting in a fractured chassis leg above the n/s driveshaft, screen surround completely missing.
It was last taxed in 1978 when it was written off by the MOT tester as dangerous. It was five years old, and scrap. Proper Alfa!