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Benelux
Have you got an 1/8th or 3/32" chain?
If 3/32, all I know is that the Simplex TdF (fairly similar) claims to be able to go up to 24 teeth, but these 'plunger' type mechs always seemed find big sprockets challenging!
If 1/8th, I doubt if you will be able to find much above 21 teeth - three speed blocks 16/19/21 are still around, but I couldn't find anything bigger when I was looking.
It seems riders were tough back in the fifties - I suppose if you started your cycling life on fixed, having a (bottom) gear in the high fifties seemed perfectly reasonable.
What would be interesting to know is how many of these flash butt welded frame were returned under warranty. This example survived 70+ years of, by the looks of it, comfy life, so yes it probably is one of the good ones. Ridden less than 1200 miles though if that cyclometer was on it from start. Brooks is not yet fully broken in, so it may just be true.
What would be largest cog Cyclo Benelux could take? Would want to keep original chainring at 48t.