Regarding maker, I think you have asked a very difficult question, because so many different makers in different parts of the world have made similar paperweights in the last 150 years! The quality of glass can be a clue to age - good quality, clear glass usually indicates a newer piece. And the base treatment can help: polished but not very circular often - but not always - indicates Chinese, and there are certainly weights of this 'ice pick' style coming out of China. The Czech Republic is another possible source. Mint condition suggest a relatively new piece too. But my money would be on a small studio maker, somewhere, rather than China.
Value is a little easier to offer views on. If I was selling one of these, I would be happy to get Â£3 / $5 for it. Not to say people don't sometimes pay more, but I have seen broadly similar items for sale in charity shops and at car boot sales for next to nothing.