Oil cap blown away?

Thank you Karl for your wise comment. For sure I’ll let you know about the decision taken. I’ve just bought another oil cap. I also checked if there was any evidence of damage due to the cap blowing off and I found none… And I tell you, unfortunatelly I am always suspicious about this old car of mine. There is always something going on with it. I am also familiar to the roar of my engine and I think I would have heard any kind of explotion if there was any. Of course “I am not sure”… I’ll refill and try again… crossed figers!

My best regards guys!