The Kawasaki W1 series - this is the 1969 version and was based on a BSA (A7). This bike is the basis for the later W 650 and then the W 800. So very much a development from the earlier British bike. Kawasaki purchased Meguro another Japanese bike company and it was Meguro who had the licence to make the BSA in Japan. Hence the BSA pedigree.
Stunning Rare (1971 Kawasaki H1 Mach 111 for Sale - £11,989.00) at Motorcycles Unlimited http://www.motorcyclesunlimited.co.uk/1971-kawasaki-h1-mach-111-for-sale/