Yes, the first give away is the 3 piece top. They were changed to bent tops very early. The door handle grew longer with time, then in the late 70's it was bent forward on the end. Your spring is a tight wound stainless spring that was changed to the spring steel course wound springs found today on many stoves right after the '76 Grandpa Bear debut. The pipe caps are another sign of very early production. By '76 most all fabricators changed over to the finned caps. Anything older will have no trees on the doors.
WD-40 was formulated for applying to the aluminum skin of aircraft. It displaces water leaving a coating to prevent rust and corrosion. It's not a great penetrant or long lasting lubricant. If you’re going to use it, the high temp will burn it off. So you will need to touch up the paint with new paint. It’s not a big deal, new paint is better than missing paint that will rust. It's there to protect the steel and easily removed or repainted.
Later doors were available with nickel or brass plate. That was new for 1980, with the advent of the arched top doors. No flat top doors were plated. To me, when people highlight the trees and FISHER, they are
posing as having the optional plated, polished highlighted doors. There, I said it. They are
posers, just like sticking the GT 500 decals on a Mustang with a V-6 posing as having a true GT 500, or raising your Land Rover and adding a winch when the most off road it sees is the mall parking lot! Rant off;
Here is a customized door that was brass plated, painted and simply wipe the paint from raised areas you want polished with mineral sprits before firing. Doing this to a collector stove is as bad as buying an all original Model T and making a T Bucket out of it adding a Chevy 327, 4 speed and chrome mags.
Custom plated Mama / Papa door before paint.
When you try to emulate that with paint, you become the
poser.
That's how you highlight doors. Anything less is, well you know.....
This has all the elements of a 1979 stove, just before the flat top doors became obsolete. This is the UL Listed type box with Fireplace Legs.
This is a very good attempt with paint. Meh, after the real thing.
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