Wouldn't the data plate indicate the series/model?

Because there are bubbles it might be that the movement of some type of air or gas is moving the oil from where it exists to the top of the bolt.
Oil pressure seems to be good. And the engine runs cool.
What could it be?

Not near oil bath. Went for a drive and noticed bubbles coming up through the oil. No white smoke coming from exhaust.Maybe stud is stretched??

Maybe retorquering the entire head bolt is in order.
Oil seems to stay in the center of the bolt and not spilling over.
So it looks like the weight of the oil inside the bolt is holding the leakage of oil down so it does not go beyond the bolt. But bubbles come up.

This disappeared from the forum

Took the car out and noticed this when I raised the hood. Does it mean anything??
It is the only one.

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Thank all of you! I do not have a NAPA in my little town. O'Rilleys, Lowes, Advance Auto could not help.
In my research on the net, someone mentioned that Harbor Freight has copper washers. I do have a Harbor Freight, so I dropped by and found a copper washer assortment with 6 washers with 5/8 ID.
I will be driving the car to my new home which is about 3 hours from my current home. So, oil and filter change, repair of wipers, air the tires and now ready for launch.
Family is coming Friday to move 3 cars in my little fleet to their new home. The Grand Dame will lead the way.
Thank everyone and especially the Grand Master Howard...

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I like to keep these around. Are they available from auto supply stores? Specs?

Km lifestyles made the sender for my 1947 custom super clipper. You have to count the number of holes and let them know what they are so they will know what sender to make. The only problem was the sender was an exact reproduction which had a cork float which had shellac on it on it. The shellac promptly dissolved because of the ethanol in our gasoline. I called them and recommended to them that in the future they should coat the cork float with the fuel tank sealant used inside gas tanks. In my case I went to JEGS and bought a fuel tank sender float. I was able to attach it to my sender and there's been no problem.

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Had vapor lock once. Electric fuel pump and new exhaust manifold gaskets by Ross Miller solved that one. Car still runs cool.