What you are selling is a handmade copy of a Lane Audio 78 rpm remastering preamplifier, model DH101/Lane. It is based on a Hafler DH-101.
I built the the preamp you have in your ad in the late 1980s for Don Seib, a long-time engineer at Wisconsin Public Radio. I had the front panel silk-screened at Screen Door Graphics to make it look nice.