This is a very nice newer model Precision 10-12 tube tester. The serial number has a “D” prefix character, and you can see the difference in the knobs used on the deck. The electronics appear to be the same as the older style 10-12s.
The Precision 10-12 is a good tube tester for the repair and restoration of vintage radios and amplifiers. Precision tube testers were built very rugged and are built almost Military grade. After the war I think companies were used to making Military grade equipment and it took a while for them to change.
Contact me if you have a tube tester you want calibrated.
How much is this one?
It is not for sale. Any tube testers for sale can be seen by clicking the “For Sale” tab at the top of the main menu. I currently don’t have any for sale.