Mason's Rules

Folding mason's rules are another collectible category of tools. Here are pictures from eBay of Lufkin's 636 and Stanley's 167 rules. They may be listed in the category:
Collectibles>Tools, Hardware & Locks>Tools>Carpentry, Woodworking>Rules, Tapes

1921 Article, "Oldest Known Trowel in This Country"

The Bricklayer, Mason and Plasterer, Volumes 24-25

Concrete Stamps

Here is an fine example of a bronze stamp used by a large concrete contractor to mark their work. It has a handle on the back. The reverse print is the actual stamp.

History of William Johnson Inc., Newark, NJ, Trowel Maker

1910 advertisement

William Johnson made a variety of forged steel and cast iron tools in Newark, NJ. An eBay search shows dividers, calipers, pinch dogs, gas burner pliers, smelting ladles, a nail puller, a faucet seat cutter, scrapers, and dibbles. Mr. Johnson was a prominent businessman in Newark in 1872, as described in The Report and Catalogue of the First Exhibition of Newark Industries. Mr. Johnson was a member of the executive committee and a speaker at the 1872 exposition, and his company exhibited "a great case of carpenters' and other tools." The firm was advertising its brick trowels in 1910 and 1917. In 1958 it was sold to C.S. Osborne & Co. of Newark. C.S. Osborne continues to sell many of the items that Johnson made, including brick trowels, an edger, jointers, and finishing towels, including some with the Johnson name.

Full text of The Report and Catalogue
Short article in American Scissors and Shears (Google Books)
C.S. Osborne & Co. website

William Johnson pointing trowel

William Johnson pointing trowel etch

William Johnson brick jointer

The Finger Level, a Novelty Masonry Tool

These advertisements for finger levels are from a 1910 masonry trade publication, "The Bricklayer and Mason".  Google Books Bricklayer and Mason, Volume 13