There's two types of Ian Mays, the ones he definitely built himself and the ones that were probably built within the trade for him and then sold as Ian Mays. All nice bikes, but that has a bearing on the collectability, with the ones having the IMCxxx frame numbers being more desirable.
I own an Ian May 531 tourer, but it is probably a rebadged frame not a self-build.
Hi I have a Ian may hand built I M C 148 stamped on bottom bracket.got to know IAN we talked about caravaning .he died young very sad .