Can anyone I.D. this?

[DART66GT]

Cleaning out the basement and found this?

 

[RedFish]

Other than a center cap for Plymouth horn ring ? Majority of those are black where that one is red. I'm not sure when or where the colored appeared. I'd kinda like to have that with my red steering wheel though

 

[Locomotion]

Could it be a center cap for a Plymouth hub cap?
Got a pic of the back side?

 

[64dartwagon]

maybe a part ## and a backside pic

 

[DART66GT]

Part# 2266771. I think its a horn button.