Here are some pics of some of my old glow plugs. Glow pluga re sort of one of those disposable things that no one saves. When they get them, they pull them out of the box or package and use them, throwing away the old bad plug. So it is difficult to find and see the old vintage glow plugs as used in the beginnings of the glow plug era for model engines.

One of the Arden Glow Plugs from the guy that invented the glow plug. Note that you could unscrew the gold plated top part to replace the element.
These were sort of a two piece glow plug. I think I am the only one to have ever posted a pic of a Arden glow plug on the internet so far.



Vintage glow plug an O&R 3/8 inch type.






A Glow Plug marked OENA M6


A AndersonSpitfire Glow Plug from the company who made the Anderson engines: