I got 2 Sterling handled service spoons at an estate auction. Both have bakelite spoons and bags with Cartier logo stitched on them. They also have Cartier stamped on the sterling handle. One spoon is smooth, the other has a serrated edge.
I've attached a photo, but would be more than happy to supply more and better photos if needed.
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Cartier salad spoons
Unfortunately there is not much value here. About $10 each, $20 if you are extremely lucky.