I had these two (pairs of) shoes made over the past three years. They are obviously different in their style and last shape – the slip-on is a relatively conservative square-toe for G&G, while the Oxford is Cleverley’s new Anthony Cleverley design.
Cleverley uses a thinner leather, generally, particularly on Oxfords such as these. (Although the two shoes here are obviously not direct comparisons, the same approach applies across both ranges.) That means the shoe feels lighter and instantly more comfortable, but it also provides less support, making your foot feel tired towards the end of the day.
Other giveaways of a Northampton shoe are the aesthetic effects such as burnishing, which requires a rotating-brush machine that Cleverley is unlikely to ever install at the Royal Arcade.