It’s not clear whether this stamp on the west side of Shepard Street (south of Elizabeth, before the I-496 dead end) is a contractor’s mark or graffiti. It’s done so crudely that I’d be inclined to say graffiti, except that it reminds me of this handwritten L. Miller stamp, which I have reason to believe is a contractor’s mark. The last name is definitely Wagner. The first name is rather obscure but might be Dan or Dave.

I can’t find anything about a contractor named Wagner working in the area in the right sort of time period, so if this is a contractor’s stamp it’s a mysterious one.