What you have is some type of serving piece, a jug or a bowl that was made by Reed and Barton. They made "Silver Soldered" pieces to stand up to the heavy use by restaurants and hotels.
This is a silver plated piece and the value would be based on its usefulness and condition since the silver value would likely be below $10.
If the condition is good and there are no dents or deep scratches the value would likely be between $25 and $50.
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Most likely Under $100.00. My guess is unless it's a big unique coffee pot or something elaborate or rare, it is probably a lot lower. I have tried to find your specific number 305 and could not. Read & Barton made a lot of Hotel serving pieces and they were usually silver soldered. If you could be more specific as to what type of piece you have you could probably get a more specific worth value. For instance, Is it a tea pot? Details in antiques are best because unique qualities and factors all come into play when figuring out value. The most expensive silver items are usually, but not always, solid silver pieces with a 925 ratio of silver purity or above. Silver soldered means heavily plated(coated with a thick layer) silver over another metal. It is not solid silver.