It's a mismatch of ivory and white. That's what it is.
We had tamper resistant switches when I started school in 1965....
I have a collection of tamper resistant keys I've gathered over the years as well. I can also open most napkin and TP dispensers in bathrooms, which came in handy during the time that shall not be named.Been around for a while for sure. I have a box of all my dad's tools from about that time and there must have been 15 different styles of these keys.
Thank the NY public school system.