|Marshalltown Evening Times Republican, 13 Oct 1899|
|Hardware Dealers Magazine, Vol. 33, 1910|
In 1911, the design changed to what appears to be an etching with larger letters, "MARSHALLTOWN" in a straight line. The company used this at least through 1921. After 1921, US copyright law makes finding advertisements much more difficult.
|The Bricklayer, Mason and Plasterer, Oct. 1911|