Because I have a brand new unused boxed original 15" BBS from a 1990 spec 16v (in addition to the 4 on my car) I can check the markings this evening. The style of the original is known as an RA - increasing good second hand ones are like hens teeth and still ridiculously valuable. You can buy new ones from GPC (without centre caps or tyres), a snip at ?188 each!!!