Not mine, Found this on gumtree -- 50th year edition https://www.gumtree.com.au/s-ad/tar...cial-50th-anniversary-edition-1985/1194509339
From my understanding there was never a " convertible " model made in the Z31 series of the 300zx. https://en.wikipedia.org/wiki/Nissan_300ZX So it looks more like it is a roof chop and turned into a convertible, maybe with approval but you would need to see the Modification Certificate.