Duncan wrote , I quote. This does not look like a Blue Riband to me. Never seen a filet brazed Blue Riband.
In reply to Duncan's comments I consider he is correct in stating this is not a Blue Riband . It is appears to to be a genuine Hobbs as the frame lettering/numbering is correct for the late 1940's as advertised.
After studying my own lugless machine and making comparisons with the pictures on the one for sale I would be almost sure this is a Hobbs "Sportsweight" . As far as I know this was the only brazed frame model made by this builder.
So ,yes a genuine Hobbs but not a Blue Riband in my opinion!
Doug Smith
North Dorset
UK