It looks a lot like a dough docker I used for a while when I worked in the pizza business.
http://www.foodservicewarehouse.com/american-metalcraft/ddch7755/p382691.aspx
Not enough clearance or diameter for a concrete tool. No matter how much oil or release agent placed on it, it would still load up. It would be a long slow job to do much area with that. Most of the tactile concrete surfaces are stamped with a sheet. Also, the imprint is opposite (sticks up in lieu of recessed). Recessed on concrete would fill up with dirt. I vote for the tenderizer.
Revisiting the roller thing a bit, I found an article (1905) that mentioned that the best concrete rollers were made by A. Gilchrist of Glasgow (UK) and were Brass......
So, the Brits at least were making brass ones...
Rusty RUSTY Rusty,,,,where were you the first time i showed these,,i have hunted high and low for answers to this one,,including contacting scottish museums,the national trust,,and parading them around various drinking holes i frequent.... mine are by A Gilchrist of glasgow...couldnt find mention of him anywhere.