12V DC Relay, Made by Finder, Type 5513.

Looks like a 3 pole 3PCO , i.e. 3 lots of ON OFF ON, rated 10 Amps

We have sold thousands of these and they are very popular with hobby and radio people

These have to go as a Parcel which costs us about 3 pounds so we are now offering free postage in the UK and have made them

a pack of 4 to balance out the costs.