I have a very large desk that looks to be walnut.

Hello, I am trying to find the manufacturer and/or any information on the maker of the desk. Attachment 12836Attachment 12837Attachment 12838Attachment 12839Attachment 12840

The size is about 3 foot on the depth and 6ft in length. The wood appears to be a walnut variety with oak dovetail drawers. The pulls are a solid Brass chalice with the center brass design being a screw in. The only distinguishing plack or mark is a small oval tag that was on the desk "S.S. & S.F.CO." then under it has the numbers 661