German, top hammer. cant really go wrong with them.
the design is very simple, and been ripped off many times, (russian, chinese hammers are mostly based on their very simple 'horizontal' valveing).
Check the dovetail areas for cracking, same as all used hammers. should be good for working 5" dia bar. if it doesnt make your eyes water when you give it a proper slap it is tired, and will need re-ringing etc, it starts to cost real money then.
if its been installed for a while they can be a real sh&t to dig out, the anvil will be less than 1.5 ton, but the 'sticktion' from the the block sealant (tar or whatever) can result in needing 20 / 30 / 50 ton to crack it, or you need to dig right down underneath the anvil to break the seal.
If its in the ground at the moment get the current owners to agree to 'load' it for you!!!!
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