The label is one used with fair to good quality Murano glass. It is a generic label, so doesn't provide any information about the company making the swans. Your swans are large and will still be desirable to some people. If you are putting on eBay, the market will determine the value for them. It is a difficult place to sell right now, though, so it is good to start at a price that is high enough to make you comfortable. It would be a shame to let them go for too little. You can get an idea of their value by checking out swans and ducks of similar size on eBay. The prices are probably very variable.