The two bulls head openers were manufactured circa 1875. Not sure about the other two, but they're at least 100 years old.
Antique Tin Can Motor Automotive Soldax-Bloc Welding RIGUPAR c.1950
Antique vintage Danish 4 pint milk can by FM galv tin brass wrought iron 11"high
4nDfUJ - Small Sand Casting Design Tin Can - Vintage - 4 CM
Vintage Pharmacy Medical Gauze Tin Botiquin TGS Gauze Tin Can 80s Spain
ANTIQUE Tin Brass & Copper Dairy Milk Can FAULKES & SONS 129 Jermyn St. LONDON