Thank you for that information.
Unfortunately, plated silver has dropped significantly in value in the last 25 years.
Your Frank Cobb plated silver tea set would have an estimated retail value of 230 GBP assuming as described and depending on sale location.
In general, a private seller to a dealer or at auction can expect 30-60% of estimated retail value.
Insurance replacement values are usually about 10% more than retail values.
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