WW1 Port of London Authority railway on war service badge

A rare original First World War 1914-1918 period badge, gilded brass circular example bearing blue enamel "Port of London Authority" title surround, Crown over "On War Service" to the centre on white enamel ground; the reverse with maker's details "J.A.Wylie & Co London" and impressed with official low issue number "330". Very good condition, retaining original buttonhole fitting, no damage to the enamel, minimal service wear.
Diameter 28mm.

Code: 55842