You already investigated it ages ago and found out it's the address from BTCChina Pool. It's been nine months since you wrote about it. Looking at the date of the first mined coins in it BTCChina mining pool might have started using that address when it split from Discus Fish.
This is rather a odd question. Why does this interest you?
1) You go to the blockchain, search an address and when you see this:
2) Depends on what you consider fresh. If you consider coins that haven't been moved since they've been mined then yes. It has no trail behind it. If you use the blockchain you will see the image above on each transaction.
3) This really depends on the pool. They can do whatever suits them more.
4) https://blockchain.info/address/152f1muMCNa7goXYhYAQC61hxEgGacmncB
This is the address from BTCChina Pool.
Update: Looks like some people partially beat me to it. I don't care about the tip though. OP if you have more questions please address them while I have free time.
1) You go to the blockchain, search an address and when you see this:
2) Depends on what you consider fresh. If you consider coins that haven't been moved since they've been mined then yes. It has no trail behind it. If you use the blockchain you will see the image above on each transaction.
3) This really depends on the pool. They can do whatever suits them more.
4) https://blockchain.info/address/152f1muMCNa7goXYhYAQC61hxEgGacmncB
This is the address from BTCChina Pool.
Update: Looks like some people partially beat me to it. I don't care about the tip though. OP if you have more questions please address them while I have free time.