At a quick glance, this looks like a standard 0.9mm lead 51 clutch pencil, but it is the rarer 1.18mm propelling pencil which was manufactured only in the UK for a short time around 1952
An uncommon Parker 51 propelling pencil in burgundy with steel Classic cap. The mechanism extends or withdraws the lead when the cap is turned clockwise or anticlockwise
Condition B - (Ref 12395)