Dynaco PAT-4 Stereo Preamp - Working Original Factory Wired

Description

Dynaco PAT-4 Stereo Preamp.  My brother bought this Pat-4 back around 1970 from a local hifi shop with the intention of finding a power amp to use with it, but ended up buying a receiver, so he never used it. Had been stored in a box for more than 40yrs before he passed it on to me.
Unmodified, clean original factory wired unit.  I've tested various inputs with a line level music source, and it still works well.
Don't have a Turntable with a MM cartridge to try the phono inputs, but the gain is high when the phono inputs are selected, so assuming they are working as intended.
Cleaned all controls/switches, and they are quiet with exception of the volume control that makes a little bit of noise if quickly rotated through it's full range.  Rear panel RCA jacks have some visible oxidation, but aren't damaged.
Unit is securely double-boxed for shipment protection.
On Jun-30-21 at 10:49:40 PDT, seller added the following information:
One EBay user messaged me that this unit was not factory wired.  I don't know how to tell this, but my brother bought this preamp new back in the day, and the internal point-to-point wiring and soldered connections were cleanly done.
On Jun-30-21 at 16:37:00 PDT, seller added the following information:
The other EBay user indicated that factory wired units had the RCA jack assemblies riveted to the chassis, while the kit versions had the RCA jacks attached with screws.  So this would indicate this Pat-4 was (meticulously) assembled from a kit.
Apologies for any confusion, but I can't change the listing now, if it makes any difference anyway.