Japanese Doll in Glass and Wood Casing, Antique?

I recently received a doll from the estate of my aunt. Looks like very old, but in perfect condition. No scratches, or smudges. It is in a glass and wood casing. 

There is a signature but I don't know what it means. 

Please refer to photo. 

Hope there's someone here who can tell me if it is of any value... and if so, how much?

I tried looking for a similar doll all over the internet but just couldn't find any. All the other Ichimatsu dolls are designed differently. Mine has a different hand gesture, and her hair is intricately designed. The Obi is also wide, while the other Ichimatsu dolls do not have pronounced Obis. 

These factors and more made me think my doll is more valuable. 

Your thoughts will be greatly appreciated.