If memory serves many/most/all 1920 pattern cars were originally delivered in "battleship grey" which seems entirely approriate given the RN's involvement in developing armoured cars. To the best of my understanding this car was delivered in this colour and remained that way though the birth pains of the new republic
A Brunswick green shade was adopted by the British army in the twenties before bronze green came into widespread use in the 1930s, but by that time Irish forces obviously were no longer bound by the dictates of the War Office.
So a qualified yes in that I think the colour is probably generally representative, but not necessarily an exact match ( exactly what colour is "battleship grey" anyway?)
