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Design-conscious health and safety types might go for this Copper Fire Extinguisher from wheredidyoubuythat.com which should blend in nicely with mid-century decor.
It's a very stylish alternative to the functional red fire extinguisher; worth hanging on the wall as a decorative object in it's own right. Not only does it look good, but it's been manufactured in accordance with all the relevant safety standards so it may end up saving your life one day.
At £185 it isn't cheap but if it means keeping the kitchen safe without compromising your retro credentials then perhaps it's worthwhile. You can buy one online here