The Crescent 22 oz. Steel Milled-Face Framing Hammer, part CHSFRM22. It has steel construction. Supplier specification: HAMMER 22OZ STEEL FRAMER MILLED CT.
Weight and face decide the tool. A heavier head drives faster but tires the arm and marks the work; a milled face grips a nail head and will not skid, at the cost of leaving a print on anything finished.
