Why do people put rocks on grave stones? Some time ago, I learned that the rocks signified a visitor. That is true enough, but I decided to learn a little more about the custom and share my findings with you. Putting rocks on tombstones is most often described as a Jewish custom. There are many "Ask a Rabbi" columns out there, but I did not find one that knew for sure where the custom originated. They all agreed, however, that a rock symbolized a visitor and when put on a tombstone said, "I remember you." I also read that some people pick up a rock wherever they are when they think of a person that has passed. Then, the next time they visit the grave, they place the rock to say, "I wish you were here." Rabbi Shraga Simmons offers a deeper meaning: "We are taught that it is an act of ultimate kindness and respect to bury someone and place a marker at the site. After a person is buried, of course, we can no longer participate in burying them. H
Since these markers were sometimes made by local foundries or blacksmiths, a Google search of 'iron grave marker' + the area of interest might produce some results. Also, the Association of Gravestone Studies (http://www.gravestone studies.org) has some general articles in their "Markers" publication archives.
I did not notice a company signature of any kind on the infant markers I photographed for the post, but I did find one on a different iron grave marker in another cemetery. If yours has a company signature, searching on that might produce some results as well.