At some point after the 1980s, L & L Construction apparently decided not to bother getting another fancy stamp and switched to this more home-made looking one. It’s a pretty common sight around my usual blocks, usually dated 1999 or 2000. This one is on the curb cut leading across Regent Street heading east on the south side of Michigan Avenue. There is a corresponding one on the other side of Regent and several others in nearby blocks of Michigan Avenue.
I used to think these had been drawn by hand, but I’ve changed my mind, because they are too consistent. Rather, I think the handwritten look is because the stamp (or perhaps stencil) was made in house and a bit rudely.
I think L & L ranks pretty high up among the most common stamps in my part of the east side. It’s not so common as the ubiquitous Cantu & Sons or the various versions of DPW/O & M, but it’s getting up there.