If your piece is something tough like a chain, I would do the following
First of all soak it in a glass of warm water with a little washing up liquid to get the dirt off.
Then try soaking in a solution of water and malt vinegar. Lightly buff with the edge of a scotchbrite pad or similar, to get any resistant deposits off. Then wash and buff with a soft cloth.
Be much more careful if the piece has paste or pearls as you shouldn't get it wet. Try a soft toothbrush perhaps with a tiny bit of metal polishaand take care.
Pinchbeck is a term that refers to an alloy of copper and zinc that resembles gold. It is often used as a substitute for gold in jewelry and other decorative items.
William Pinchbeck was born in 1831.
Val Pinchbeck was born in 1931.
Pinchbeck Engine was created in 1833.
Christopher Pinchbeck died in 1732.
Christopher Pinchbeck was born in 1670.
Val Pinchbeck died in 2004.
William Pinchbeck died in 1893-07.
Pinchbeck railway station was created in 1882.
Daniel Pinchbeck was born on 1966-06-15.
Cliff Pinchbeck was born on 1925-01-20.
Pinchbeck railway station ended in 1961.