Saddle looks to be a Brooks Professional. possibly original, but in good shape +1 there
as for the brake cable using the clamps and not the brazeons, this as i gather was a common thing as it was felt the Braze-ons were installed on the wrong side for most Brake setups.
My Paramount i used the braze-on and just had a little bit longer cable housing from the braze-on to the Brake caliper.