Liked design, purchased, looking for more information

I bought these on ebay because I like the look and design. I was wondering if anyone had more information on them (age, authenticity, etc). The have "Monchshof Brau Kulmbach" on the front of them and are 5" tall, 18 - 20 oz. I didn't see a year on them. I did a quick google search but didn't come up with much other than a quick wikipedia article. Thought I'd turn to collectors and enthusiasts. Any information would be helpful. Danke!