A Late pre-WWII PX4 - with finned anode
width="600" height="450" width="600" height="450" PX4.org - Photo Gallery
width="600" height="450" This is one of the last pre-war PX4's, by this time the anode was fitted with fins.
width="600" height="450" This is one of the last pre-war PX4's, by this time the anode was fitted with fins.