7kg cast iron dumbbell

Cast iron work weight painted in black 7 kg with a nice patina, it must date from the 50s. It is in its juice, with various wear and use marks: traces of blows, scratches, stains, rust that has attacked the metal, and original black paint, largely started. There is a "7" marking on each of the "weights." It is 33 cm long, and the diameter of the "weights" is 9.5 cm.