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This is English hallmarked sterling silver.
The lion passant indicates this is British sterling silver.
The leopard head means that the sterling was assayed in London, England.
The letter (not a number 1) is a small case letter L. The cartouche shape the "L" is within is tri-lobed at the bottom, thus dating these to 1906.
The initials SG are for the maker Sebastian Henry Garrard.
The engraving on the handle end is a coat of arms, and these were common on this type of flatware.
These can average $30 - $45 per piece on today's market. The total value will depend on how many pieces there are in the set.
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