There are certainly bronze chains (see e.g. http://www.halochain.com/hal-o_chain_co_2_007.htm or http://www.nextag.com/bronze-chain/search-html ).

You could try checking its density to get an idea if it's likely to be bronze, but this may not be definitive since bronze is not a unique identifier of the alloy. There are different bronze alloy compositions with densities varying between 7.4 and 8.9 g/cm^3 (see e.g. http://www.simetric.co.uk/si_metals.htm ).

To measure the density do the following:
- Take a graduated container large enough to hold the chain twice over.
- Pour enough water into the empty container to cover the volume the chain would fit in (this should be no more than half the container).
- Weigh the container with the water and write down the weight.
- Measure the volume of water in the container and write it down.
- Put the chain into the water (the water should more than cover the chain in its entirety).
- Measure the new weight and write it down.
- Measure the volume of the water now and write it down.
- Subtract the first weight from the second and write it down (this is the chain's weight).
- Subtract the first volume from the second and write it down (this is the chain's volume).
- Divide the chain's weight by its volume (this is the chain's density).

If you measure volume in cm^3 (also known as cc or ml, for cubic centimeter and milliliter, respectively) and the weight in grams, your density should be in the range of 2 - 10. If it's in the range of 7.4 - 8.9 you may have a bronze chain. If the density comes out around 7.5 - 8 it may be stainless steel. If it's just over 8.9 it may be copper.

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