Today’s stamp is in front of the same address as yesterday’s – the Budget/Avis lot on the north side of East Michigan Avenue between Kipling and Lasalle Court. It’s just east of Kipling, close to the crosswalk.
The E. T. MacKenzie Company was established in 1982 in Grand Ledge and still has its headquarters there, although it now also has a few branch offices in Michigan and one in Florida. They offer construction, demolition, and remediation services according to their Web site, so I guess you could say they’re a Mack of all trades.
Notice the style of the stamp. I first encountered it as the new style O & M stamp, and have subsequently observed it in use by several contractors. Evidently some third party sells them using a standard template. They look neat enough, but I would sacrifice orderly for unique.