I have an item I think is a large vintage cocktail shaker, but am not sure. Is there a place I can post pics to find out what it is?
You can post the pictures of the item you think is a vintage cocktail shaker at a site like http://www.cocktailshakers.com/. On the site, they buy and sell cocktail shakers so they are capable of informing you if it is a vintage.
You can also look at vintage shakers on eBay and se if there is one like it