This is almost certainly a contractor’s stamp, but it’s hopelessly illegible. The size, shape, and placement are reminiscent of the “second style” of Lansing DPW stamps, but I don’t think it is one. The only letter I think I can make out – maybe – looks like an M. It might be the first letter, but that’s not clear. In any case, the letters that can be made out do not seem to fit with the “Lansing DPW” mark.

A closeup of the stamp.

The stamp is on the east side of South Hayford Avenue between Michigan and Prospect, in the 100 block.

Further away, to show size and placement.