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First, this is not a cream pitcher or tea pot, but a coffee pot. It is vintage hotel ware, used in old hotels or restaurants, and is a popular collectible.
Hotel silver was made to last, of copper composition plated with a heavy layer of soldered nickel silver. Nickel silver is 60% copper, 20% nickel and 20% zinc. There is no actual silver in it, but it does give a high shine when polished, and will last for decades, making it a cost-effective choice for hotels.
The "M" on the spout, could belong to the manufacturer, but is more likely the monogram of the hotel or restaurant in which it was used. Of course, those pieces that are identifiable as belonging to a particular establishment command the highest prices.
If your coffee pot is in very good condition, its current retail (replacement or insurance) value is approximately $75. If you were to sell it, you could expect to get the fair market (private sale or auction) value of approximately 40% of the retail amount, or $30, depending on location and actual condition.
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