It has the normal slide fixing bracket to the the rear holding for a 20mm fixing shaft.
BR RAILWAY LAMP SHERWOOD LYNLIGHT BRASS BURNER & WICK 80MM SHAFT
RAILWAY LAMP SHERWOOD VAPORITE CERAMIC BURNER & WICK STAMP BR LMR DAMAGE
BRITISH RAILWAY LAMP SHERWOOD BRASS BURNER RESERVOIR 68MM & REFLECTOR ASSY