eBay
This is a rose gold tone chain with a T bar and working dog clips.
Total length is just under 16"   The Dog clips work great!
This is marked HAYWARD with no gold marking, 
thus indicating it is older. 
(before it was required to mark gold content) = Victorian  
Others I have seen are listed as gold filled so probably 12K or 9K.

The fob and T are on a sliding piece that can move to any part of the chain.

This was from my mother's antique shop.

Other metals it may be:  a combination of brass, copper, gold

I have other watch chains available. (not yet listed)  Feel free to contact me about them.