This very worn and craggy stamp is on the east side of Regent Street between Kalamazoo and Elizabeth (500 block). I read it as L. Miller, 1963. It looks handwritten, and could almost be taken as graffiti, but I lean away from that interpretation because the the placement and name/date format is standard for contractor stamps.

I can find evidence of a contractor and builder named Lloyd Miller in some mid-1950s Lansing State Journal classifieds pages. Miller was based in East Lansing. There also seems to have been a Lloyd Miller real estate agency during the same time period, so it seems like ol’ Lloyd would build you a house or sell you one. My guess is that this is Lloyd Miller’s mark.