British Derby Police Handcuff Set with Key: Original Victorian Era (Fully Functioning) Hand Select:No The principal change was to

The principal change was to stamp the ventilator hole mounts directly onto the shell

we inspect each to ensure there is not damage

Cloth protective cloth visor cover is available separately

The Lanchester is a submachine gun (SMG) manufactured by the Sterling Armaments Company between 1941 and 1945

in other words

British Derby Police Handcuff Set with Key: Original Victorian Era (Fully Functioning) Hand Select:No The principal change was toOriginal Item: Manufactured by Hiatts of Birmingham, the Derby Pattern was the standard British Bobby Handcuff for over 100 years until replaced in the 1950's. Heavy nickle plated, each pair comes with its own screw key and is maker marked.