BB chrome oil fill cap rivet w/s + dimple survivor
 

Chrome big block oilfield cap. S stamped ribbit. Underside of rivet has early style large dimple. Seal is in excellent condition. Chrome has some aging and pitting very very nice patina great for a survivor. $40 shipped to the lower 48. https://www.yenko.net/ubbthreads/pics...3_19.08.48.jpg
https://www.yenko.net/ubbthreads/pics...3_19.08.32.jpg