This looks to be a silver mounted cut glass claret jug typically late 19th century period. The quality looks to be very fine. It's always difficult to value something without handling an item but as a rough guide I would say $500-750 if there is no chips or damage to the glass.
Not sure how much your lovely jug is worth but it is so beautiful, why would you want to sell it? Value and worth are two different things...you never get its true worth when you sell.