Yes, I know we have discussed this topic before, and at some length. My hope at this point is that perhaps you have learned something more, or a new guy is out there reading this thread who has the whole story (ha!). Still, I don’t know why these particular weapons are so difficult to get a handle on. Certainly the ex-USN Mark IX 4-inch/50cal shipboard guns (used in Dutch coastal batteries), the National Forge 37mm antitank guns, and a whole raft of other export weaponry have been well documented for years. The Mark VII 3-inch landing guns undeniablly remain a head-scratcher. By the by, during WWII would the Dutch armed forces have designated artillery pieces in centimeters or millimeters, e.g., the 3.7cm antitank gun rather than the 37mm AT gun?