Fiamme rims update
To add further to this :
I have now learned that these rims were available as early as 1934. I have found an advertisement in ‘Cycling’ dated March 2nd 1934 advertising these. It seems that the Tabucchi Tyre Co were importing them at that time (Described as duralumin tubular 9 oz. rims).
At 32 shillings per pair they were hugely expensive. In a 1936 issue of 'Cycling' they had increased in price to 17 shillings each and Claud Butler was offering these as an alternative for some of his models. I have recently acquired another pair of these on early Fratelli hubs with the 'Milano' stamp which I believe may be pre WW2. These are 19 mm wide (i e very narrow) and extremely light.
Whilst they carried no labels, it is worth remembering that self adhesive labels were generally not around until after WW2, Stan Avery having (supposedly) inventing them in the late 30's