Strictly speaking this is not a US cover, but I suspect the cancel may be and I hope that there is an expert here who can help me.
I have this example on a loose stamp, but am showing a complete cover taken from the book "CURACAO: An Identification Guide for Cancels" by Dick Phelps. My question concerns the barred circle 12. The stamp is from Venezuela, and the transit mark is Curacao (exact year uncertain) and the cover is to New York.

Does anybody know where this mark is from? When I asked Dick Phelps, he didn't know.
Jan