Finishing 2nd on the Halloween Event 2021 leaderboard is the only way this unique gun was ever handed out, so it is not obtainable anymore. Only a few exist, and deals happen privately rather than on open listings. If you are after one, expect to negotiate directly with a collector.
Questions players ask
How much is Silver Harvester worth?
There is no stable price: trophies rarely change hands and deals happen privately. The number on value lists is symbolic.
Can you still get Silver Harvester?
No. It was awarded for a leaderboard place in an event and is not given out again.