Very nice. It’s a 1 taler silver coin of Johann Georg I, Elector of Saxony from 1611-1656. Your coin is from 1636. German States provincial coinage.
If genuine, in that lovely condition it would be a $300 plus coin, approaching $400 (what you might have to pay if buying from a dealer, not what you could expect to sell for), but beware that talers are among the most commonly faked coins. I don't see anything obvious which suggests its not authentic.
However, even if genuine, the solderwork detracts greatly from its desirability to a coin collector and couldn’t be easily removed without leaving a conspicuous mark. Worse still, there might be a hole nestling underneath that solder.