Belt Buckle Hallmark help please?

Hi, I brought this belt buckle at a car boot. Could people help identify if it is Silver and if so help me identify the hallmarks? Many thanks.

Reproduction of 1910 design created in the early 1960/1970. Pewter.
Initials “WL” or “TM”?



Sitting Bull Chief of The Sioux.

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Thankyou @Bartholomew. So does that mean it is pewter not silver?

Any other hallmarks?

No other marks at all unfortunately.

Since the item does not have obvious markings indicating that it is made of silver, you should take this belt buckle to a jeweler for analysis.
Do you already have it? If so, take some detailed photos.

And don’t use silver polish on it unless you are sure that it’s silver. Pewter and silver polish do not mix!

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Thankyou both for your help, much appreciated.

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What is written (embossed) on the leather of the belt? (type, manufacturer).