The 4-16x42 seems to command a price of 1800-2000 depending on condition.
I have purchased 2 in the past year, one was between$1800-1850, one is a locking single turn H27 model and the other is a single turn P4F.
Some quick notes: the H27 is useable, good reticle thickness for many power levels. The reticle is very similar to an H58. The scope you are looking at is mostl likely contract scope from mil. If it is it will have a number etched on as well as a qr code. Does not change value but is unique. The locking single turn turrets is tall and the clicks are horrible. It might be one of the mushiest turrets S&B makes. In true Horus fashion, it was designed to primarily be zeroed, locked and ran with hold overs.
The regular single turn turrets are excellent. Sharp tactile clicks and good turret size. Firm enough to not worry about them.
Oh, and be aware these scopes do not have large amounts of travel, not sure on the double turns but the single turns are 13mils. It is designed for a 28moa base, with a 20 moa base one of my guns has about 9.5 mils of travel.
And these scopes are long, with the smaller objective they look really long.
EDIT: My brain was not working when I typed this. I purchased one of the above mentioned scopes for around 2200. If you pay attention to the PX, these scopes have been listed, and I assume sold for, the prices mentioned above.