This is my go to girl,
It is carbon steel, beveled to a knife edge on one side. The edge is hard, as i carles ly chiped it taping it on the griddle. It belonged to a friend of mine that was a WWII and Karean war cook. I have used hand saw blades to make spatulas, especialy the cheap "toolbox" saws like the "shark tooth" and heattreated them much like a knife blade. (I do one of those saws in about once a year, and at the price I dont resharpen them)