> I have a Gran Sport with the swallow saddle but I've no idea what fenders
> graced it originally.
I am pretty certain the Gran Sport was fitted with the rather lovely Britannia "Sprint Veloce" celluloid narrow mudguards.
I have a pair of these 'guards on my '49 Clubman which came from a Gran Sport (according to the seller) so if anyone has an earlier wider style of Britannia 'guards to trade..... and I need a pair of the black Sprint Veloces for my '61 Lenton.
Personally, I much prefer Britannia 'guards with their nice "quick-fit" dome nut fasteners... the more common Bluemels are an absolute fiddle with those tiny little hex nuts. Raleigh bought 'guards from these two makers and others as well.
We British bike guys simply cannot get enough of the proper mudguards. They are essential. And hard to find alas. I must say it's a lot easier getting used to riding a bicycle with derailleur gears than one without 'guards... the thing looks naked and exposed. 'orrible really.
Washington DC USA