Vintage Unbranded Tool.

Some Rust.

Some Wear.

See Photos.

Possibly Witworth Dimensions.

Lock Ring Spanner,

6.3mm=1/4”.

9mm=23/64”.

11.5mm=29/64”.

13.5mm=17/64”

15.5mm=39/64”

16mm=5/8”

30.5mm=1 13/64”.