It weighs 5 Lbs and almost 5 oz. No RR marks that I could find but there is a number stamped on it 311663. Sold as is for restoration of as a collectible.
Hubbard Slug Devil Railroad Spike Driver 9.35Lb Vintage Track Maul Sledge Hammer
Vintage Slug Devil Railroad Spike Driver Sledge Hammer 8 Lbs 11 1/2 Inches
Vintage Cut Devil Railroad Hammer Heads Marked P.M RY Pere Marquette Rail Yard
C & O Railroad Spike Driver Hammer- Cut Devil 150-AX 6547567 ~ PR625
Vintage Cut Devil 5lb rail cutter/hammer head (C&NW Railroad) M683
Reading Company Railroad Maintenance Of Way Cut Devil Hammer Head