Technical any old mag wheel experts?

I have this set of 4 old keystone magnesium wheels, never seen any before, any info on these?

 

Look like vintage olds style
Maybe from the mid 60'?



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ya, they weigh about half of what an alum wheel weighs

 

maybe alum? seem a lot lighter than an alum wheel

 

unique find

 

I always had a hard time looking at the wheel in that top ad. As a teenager, I thought the reflection was pretty interesting.

 

this good looking wheel was for drag racing. dont know the name, but its real keystone mag.

 

grind on some shavings, and see if they go **** ! just kidding !

 

They are Keystone K Mags - do you still have them? What size and do you have the original caps? They are extremely rare, only made for one year. The K Mags came with magnesium caps, although my set seems to have been fitted with run-of-the-mill die-cast zinc ones...

 

Care to post a pic of yours for us to see? The '73 Keystone catalog mentions a 15x3-1/2" K-Mag with a stated weight of 9 pounds, then shows another wider version in front of the skinny wheel, presumably also a K-Mag?:






I stumbled upon this topic after picking up a pair of 15x7 Keystone Rogue wheels yesterday, then did the Google search and found the vintage wheel catalogs page with the K-Mag shown for 1973. Seems like Keystone got their money's worth out of the molds, making a few variations of the same design with the Rogue, K-Mag and Snomag.

https://vintagewheelcatalogs.com/keystone/

 

A drop of vinegar on the back side will tell ya. Bubbles=mag. Nothing happens=aluminum