I have a vintage Luxembourg souvenir Spoon with marks as below. is it a solid silver or plated? I can not find any hallmarks info about Luxembourg. I found a similar Luxembourg souvenir spoon. The seller said "Tested BY OUR JEWELER as Sterling Silver". Thanks for your help!
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![Image](https://i.ibb.co/RjBjfYR/20210721234442.jpg)
![Image](https://i.ibb.co/4m6j3Fp/20210721234500.jpg)
item's hallmark:
![Image](https://i.ibb.co/k8BnTgF/s-l1600.jpg)