Set of 6 vintage liquour mini goblets in case

I received this item as a gift from a friend several years ago. She purchased it at a garage sale and after I have done some research I have learned that there should be markings or hallmarks on the bottom of each goblet. However, there are no markings at all so I'm having a difficult time determing the age and value of these goblets. I would like to know if they are real silver or silver plated? What country were they made in and by what company. I would also like to know the approximate year they were made. Thanks so much for your time

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