I hate to throw a wet towel on the subject, but this is far from master engraver material. It's lovely, and unusual to see in such a color combination and style of mug, but the engraving is not extraordinary or very difficult. The bottom makes me think not Moser. It seems like it would be rather peculiar for any of the major Bohemian/Czech makers because there's no flat part. Doesn't it seem like there's at lease a flat ground ring on the bottom of most Bohemian glass, if any grinding is done on the bottom? Maybe I'm wrong there. There doesn't seem to be a lot of wear to the bottom.