Up for sale is a set of corthay, John Lobb and Crockett and Jones. I work in the tech industry now and don't have the use for them anymore.
They all fit the same, even if the sizes of the pairs vary.
I am a US12/uk11 in Nike for reference and they all fit perfectly.
All shoes are pre-owned but...
Corthay's signature two-eyelet derby in a unique Vieux Bois patina. Size 8.5uk on Sevres Last. Fits like an 8uk/8.5us. Complete with box, shoe trees & dustbags. Original price £1,350 bought at the beginning of 2017.