Wear is indicative of age. Artifact of an identifier mark (see last 2 photos).
Vintage Cast Iron 1 Lb Dumbbells 1 Pound Weights - B
Vintage Cast Iron Dumbbell 1 Pound Weights "M" 1 Lb Weight
Vintage York Cast Iron 1 LB Pound Dumbell Classic Paper Weight
Antique Square Cast Iron 20 lb. Dumbbell Weight Vintage Fat Grip Dog Bone
CAP Barbell Coated Hex Dumbbell, Pair 10 lbs free cast iron kettlebell lb pound
Antique Vintage Cast Iron Dumbbell Round Head Hand Weight Weighs 43.12 lbs!
