I am having some difficulty learning about this bottle. The maker's mark appears to be "G" beneath crown. I believe the manufacturer is Gerresheimer Glas. Any thoughts on if this manufacturer is correct and which one of these numbers is the date code?
Yes, definitely very new. I can't understand anything on the base apart from 0,375l which is obviously the contents, but I doubt it predates the 1960s and could be much newer than that. I don't see anything to suggest that it couldn't even be from our current decade.