Peter,
Didn't L42 chests come new from the manufacturer painted in the gloss "bronze green" - the same as 1 Tonne Landrovers and other vehicles before they got their IRR paint ?
I have a new condition chest and its in the bronze green. My other L42 chests just seem to have been overpainted with the normal IRR matt green (less for one which is gloss black, marked to Manchester Police and altered to fit two Enforcers...).