Just found a couple manuals for Westinghouse transformers. This should help us confirm the later versions of Westinghouse transformers (Westinghouse Electric Corp. era):

http://www.electricalpartmanuals.com/pdf/transformer/Westinghouse/Distribution%20Transformers/I.B.461001.pdf

And fortunately, one from the Westinghouse Electric & Mfg. Co. era:

http://www.electricalpartmanuals.com/part_manuals/pdf/transformer/Westinghouse/Distribution_Transformers/IB5922.pdf