So almost certainly a Lionel version. Most I've seen have "LIONEL LINES" printed below the Sunoco logo as part of the lithography, but I have also seen a few without the "LIONEL LINES" designation. There was also a "UNION TANK LINES" version. I believe all of these were manufactured to be part of Lionel's Winner line, a low-end offering during the depths of the Depression. The 151X-series originated in the Ives line, taken over by Lionel just as the economic downturn was ramping up (down).
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