This is an example of an 69 mm dia size  reflector for a 3 aspect handlamp - usual slide fixing to rear in metal as used in the steam times on the British Railway system as per the photos  .It is in good solid usable condition . It would transform that old lamp very well . It will slot on to the upright on the rear of your reservoir which had different width of slide fixing -  This is suitable for a 30mm shaft see photos . the width could be adjusted  if you are handy at metalwork . 2 available 

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