Entry level nightvision. MU-3 KOS with Photonis XR5 tube.

Looking to Sell my old nightvision mono. A Polish military issue MU-3 KOS housing with a blemished autogating Photonis XR5 tube. Glass and housing are in good condition. A 3D printed dovetail arm, hard case and sacrificial lens cap will be included with the deal.
Typical specs are listed here.
http://www.dmphotonics.com/Image_sensor_fiber_coupled/xr5_Image-Intensifier_product_sheet.pdf
According to Cold Harbour Supply, the current $3900 NNVT tube PVS14s they sell use XD-4/XR-5 tech, to give an idea on performance.
https://coldharboursupply.com/blogs/news/nnvt-vs-photonis-echo-preliminary-comparison

Asking $2300 OBO