I rarely repeat photos, but I'm making an exception for Missouri 1 in Kansas City, because I have two excellent close-up examples comparing the regular-style Missouri marker (left) with the "pointy"-style marker (right).
If you look carefully at the northwest corner of the state's outline on the left marker, in the Platte Purchase area of the state, you'll notice that it shows the state's border as a straight line, instead of showing the indentation near St. Joseph as do most other state markers. The Bootheel is also different from the usual state highway marker. I call this a pointy marker. Other examples can also be seen in Mexico at the US 54-Missouri 15-Missouri 22 interchange and near New London at the US 61-Missouri 19 interchange.
Missouri 1 is a relatively short highway in Kansas City and Gladstone. Along most of its length, it's the designation for Antioch Road, a major thoroughfare in the Northland. It doesn't appear to run along any portion of the original route for State Highway No. 1, which for the most part is now US 71.
These photographs were taken August 29, 1998.