thanks everyone for your replies.
I have a very generous member hooking me up with one.
I figured that I'd share a link to another discussion I found last night which is hosted here on this same very subject, and share some pictures of the rad cap I have (I did a light cleaning of it post rust dissolver soak).
LINK
I don't know if sometimes these were stamped lightly/poorly, but the bottom of all the letters in "REMOVE SLOWLY" fade into nothing - and the counter clockwise arrow that I believe should be above that same text is barely visible at points to the naked eye.