It looks like an historic. But it dosn't look like any of the brown bitone TBs that I see pictured in the database. However, in making that search of the database, I noticed that most of the search results had never had photos entered for them. So it's likely that you will never be able to determine its cultivar name. On the other hand, it may also be an unregistered seedling. . Probably your only chance for identifying it is if some member has it and recognizes it.