Most of these ginger beer bottles are worth perhaps £10 or so with the occasional rarity going up to 3, or sometimes 4 figures! The important and most satisfying thing is that you found it, and with the the story of how you came to have it....that is priceless. Now that you have one how about looking around or at least keeping your eye out for a few more from your locality, for a shelf in the kitchen perhaps. It can become addictive though like any hobby or pastime.