BC59 Don't sell it's the Holy grail,that is a real dandy !! I don't covett it too much cause I use alternator and HEI ignition. It is a rare and fun item to show to your pals !!
It came from my mom's stepfather, he gave my a bunch of tools when I graduated from high school. He was an old time mechanic / machinist. An old friend whose father was his buddy told me at one point he would go to shops around the Portland area turning crank rod journals, babbitt & resize rods to fit then on to the next shop to do the same. He had carbon monoxide poisoning, would have to put on a gas mask to be anywhere near exhaust. got better near the end of his life but I have always been the shop nag, "put a hose on it!" Still use several of his tools but have never seen a electrolock system up close.