If you think it is valuable it may be worth popping along to Sotheby's in Chester. I believe reputable auction houses give the least biased opinion. They will also advise how to auction it eg specialist dates for the stuff you are auctioning. They may charge for full valuations but will often give you a good idea if your silverware is run of the mill or not.
In reality, very little silverware (even old stuff) is worth much more than its weight when selling to a dealer, silverware is a very slow selling commodity apart from a few sought after items.
If you are selling by weight then the old small stall in Birkenhead market gave the best rate that I could find, he may add a bit for interesting items.
Don't assume damaged items are worthless, sometimes even badly damaged items have a good value due to demand for that particular item.
Edit: Just noticed that Bonhams do free valuations, so perhaps Sothebys do as well.
Edited by diggingdeeper (28th Oct 2011 2:01am)
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