Can you identify this cup? Well, not just the value, but who made it and what period it is from. Thanks.
It was not easy to identify your mug as the mark on your mug belongs to the German Porzellanfabrik (China factory) Galluba & Hofmann (Ilmenau, Thuringia), which is known mainly for its figurines. This factory worked from 1888 to 1937. But as it turned out, they also made very decorative cups/mugs. It is difficult to tell exactly the period of use of the mark on your mug with initials 'G' and 'H' on a shield with additional GERMANY, it was after 1905. www.porcelainmarksandmore.com/
So, you have Galluba & Hoffman Porcelain Mug Ilmenau, Germany c. 1905-1937, the price is about $17-20.
It is from Germany. If no one else knows, replacements.com can usually identify it.
Very pretty little cup. This one has similar markings on the bottom, and includes a saucer for $32 @ Etsy:
There are similar looking cups posted for sale on many sites online and many are German but without a brand name you would have to look at each listing to see if it had the same marks and, for some reason, sellers do not seem to like posting pictures of marks as much as they should.
For value: probably not very much as most of these are for display and usually cups and saucers sell for more than just one cup.
You can always start with a higher figure and lower it if necessary.