This is an extra large sewing awl, produced by Barnsley & Co in Sheffield.
Housed in an oval beech wood handle is a sturdy diamond profile stitching awl blade, ideal for sewing large stitches through thick layers.
Dimensions:
Handle - Oval beech wood saddlers style handle, 95mm long.
Blade - Protrudes 45mm (1 3/4") from the handle and has a diamond profile 1.8mm thick x 3.2mm wide.