Thxs for the serial number. I wonder if there's a prefix under that country of origin label? Regardless, it would appear to be from 1991 based on the S/N and Shimano 300EX.

Interesting how this is another Boyes & Rosser product, like the BRC you acquired. Even though they are 5 years apart, I assume they came from the same seller and probably originally from the same LBS.