I think you are right, or a good copy.I think these are Breyton 'Magic' 18 Inch wheels. Give them an image search.
These won't be that common but there is a knackered set on UK ebay for £100. Here
With the levels of dish and the perceived rim diameter, I would suggest these are not oem wheels nor style 61s.
Dino has the Breyton Magics, mine were Softlines which were 5 spokes.
They do look yummy but cleaning them would drive me mad. I've just changed to a set of style 68 wheels because I got fed up of cleaning my style 42 split rims
I think those wheels would fit my///M, maybe would require a spacer at the front but might be a bit much at the rear with ET 13 v ET 8
Compared to style 42s 68s are a doddle, plus they are darker and don't show the brake dust as much. Unfortunately my crapy brake calipers are now visible so it will soon be out with the caliper paint. Something tasteful I thought so I've gone for porsche acid green![]()