This is an extremely rare find as there are only about 100 of these made by the leading spring reverb company in the industry.  Accutronics was developing these pro level rack units in the late 90's to sell to the pro studio market.  They got as far as this initial run of 100 and never went to large scale production.  Known by many pros who own them to be a great sounding spring reverb as well as great tube stand alone preamp.  This particular one was always kept in a smoke free studio and has mostly been used by a pro mixing engineer.  I have recently fired it up to test it and it seems to be giving me some issues-- I'm not getting a strong level but I am not a sound engineer so I may actually be hooking it up wrong or using it incorrectly.  It may be simply in need of new tubes or some minor servicing or may actually work perfectly as it should.  Since I'm not getting what appears to be optimal results I am selling it "as is" which makes this a great find if you are familiar with the value of this unit.  Typical light surface scratches can be seen from moving the item in and out of racks.I'm not sure the last time I've seen one for sale and don't think you can currently find another one for sale out there.  No Reserve.  Get this one while you can!  Thanks for looking!