Further to any posts I have made, above, I have just found (on the net) the 1938 Sun Catalogue (see

threespeedhub.com/wp-content/uploads/2013/04/SunCycles-Catalog-1938-UK.pdf )

I am not permitted to post URLS so you probably have to copy/paste it

It confirms my memory that the Manx TT was originally a normal Diamond Frame with the 'Strutted Bracket' , though I didn't recall the original Manxman as listed .. (I was only 3years old in 1938) .. with a standard Diamond Frame.



I note there is no mention of Reynolds 531 (unless I have missed it)