The scroll on the mandola reminds me a lot of early banjos (see below).
As for Embergher mispelling... I have a feeling that he was a thrifty craftsman and had a stamp made with the mispelling and did not want to spend the extra money to have it corrected until later. Either that or perhaps people mispronounced his name with the "h" so he left it off intentionally.
This mandolin is pretty appealing to me because it is early which means that the signature is actually Luigi's and more likely he did the bulk, if not all, of the work on it. I also found out that this mandolin by its serial number was in the shop, maybe even on the bench next to the celebrated Embergher mandoliola (mandola in US terminology -- tuned CGDA) owned by Silvio Ranieri. As you can tell, I love getting into the minutiae of these vintage instruments, each with their own story, hidden in the details.