How much is a bottle of johnnywalker swing whiskey worth 1820?

I need more information to answer your question accurately. "1820" could refer to a few things:

* Year of production: If you have a bottle of Johnnie Walker Swing from 1820, it's likely extremely valuable, a historical artifact. You should contact a reputable auction house or antique appraiser for an evaluation.

* Bottle size or type: "1820" could be a reference to a specific bottle size or limited edition.

* Other markings: Are there any other markings or labels on the bottle that could help identify its specific edition or vintage?

Please provide more information so I can help you determine the value of your bottle.