Audio Research LS17SE (used) - Serial #93103703. Silver (ARC calls "Natural") faceplate. Preamp is in excellent condition. This is a good choice if you need XLR jacks. If you don’t need that you can do a lot better with a PrimaLuna ProLogue Premium preamp for about the same price. That’s what this preamp was traded in towards, and the customer never looked back.
Retail was $3995, yours today for $2399.