Well not too many folks took me up on my "mystery" caboose, so I expect it will remain a mystery. I do agree with Rusty's comment that it must have been made from Marx molds / dies. Its too close a match for much else and it makes too cheap a car to justify the expense of a new mold / tooling. I expect that its made from some tooling that Marx let go when they were closing down train production or some tooling Marx exported to a foreign country for further use but did not license the trademark.
Still looking....!
Best wishes
Don
