Angelo,
What you have described is a variation that I have never seen documented previously. First some clarification as to what has been previously posted
First, the 2020 always came with a 2020W or 6020W Lionel Lines tender. This is a 2446W body style tender. In 1946 no number was stamped on the tender, but only on the box.
The 671 came with the same style tender, although numbered 671W through 1947. The electronic control 671R always used this style tender as well.
The 671 came with the 2671W twelve wheel streamlined tender lettered “Pennsylvania” beginning in 1948. There was no “number plate” molded in the shell.
In 1950 the turbine number changed to 681, but the tender remained the same. In 1952, due to the Korean crisis, Magnetraction was dropped, the number reverted to 671, and the tender changed to 8-wheels, retaining its “Pennsylvania” lettering. The number of this tender was 2046-50 (aka 2046WX), but that number did not appear on the side of the tender. When Magnetraction returned in 1953, the number went back to 681, but the tender continued to be the 2046-50.
The -50 suffix denoted “Pennsylvania” lettering, as the normal 2046W was lettered “Lionel Lines.” Some of the 2046W Lionel Lines tenders have 2046W stamped on their number boards. These tenders also have their rear “portholes” filled in. All of the 2046W tenders have metal trucks.
In 1960 a new Pennsylvania tender was introduced, the 736W. This tender at a glance looks like a 2046W-50. However, it rides on Timken (AAR) trucks, and has “736W” stamped on its number board. This tender was supplied with the 736, 637 and one year’s production of the 773.
Note that no where did I list a 2046 lettered both “Pennsylvania” and “2046.” If that is indeed what you have, you have found a previously unknown variation. The first step in establishing its authenticity would be making sure it does not have Robert Geller or Model Train Sales molded inside