This listing is for a set of 10 coasters from Melita that are still in the original package.  They are undated but the style appears to be the 60s or 70s.  My translation app says the front top says "10 count Drink coasters Proverbs Recommended Retail Price DM 0,95"  the first coaster in the pack roughly translates to "He who builds by the way has many masters"  The very bottom translates to "Order number 1-6000-38."  I would venture a guess that they were made in Germany for the company to be used with their coffee.  This set is extremely rare and I have found none like this anywhere used or new.