Ebony Smokers Cabinet By G H CLARK.......Valuation.........Please Help

Hi all, I have just bought a fantastic solid ebony smokers cabinet, the cabinet was the first piece the cabinetmaker made for himself in around 1910-1920. It has been in the same family ever since. It came with a photo of the maker and some documentation, (newspaper ads and patent slips all in the name of the cabinetmaker) I have no reason to think this isn't true or real (a rare find). According to the seller he made chairs and a table for Manchester Town Hall. I am yet to do research on the actual maker but I'm assuming he isn't famous for any reason, I am trying to find any comparable piece for a valuation but I can't find a single one anywhere else made from solid ebony. The cabinet has solid ebony apart from the back, the glass has a very deep bevel, the handles are cast brass and all in wonderful condition apart from a small shrinkage crack that travels 3 inches along the top and stable (common with ebony) The photos do not do it justice, taken tonight quickly while my Son was asleep in the same room lol
I would really appreciate any help or guesses to it's value?

 

Wow! Beautiful!!

One of a kind, so difficult to find comparable values.

 

Thank you, I know right lol, the photos make it look different colors but in real life it looks mat black all over

 

LOOKS BEAUTIFUL!!!! One can just SEE the thickness of the GLASS!!!!!

 

Yes the glass is very thick, I think he used the thick glass to get a deep bevel.