Those look like gen 1’s. Ultra is the series just below Transparent’s Reference level, considered to be their best value. Quick check for Gen 1 Ultra Balanced MusicLinks is around 350 pounds. That’s around $385 USD. Later models are much more spendy.
Transparent has a trade up program so you can have your transparent cables updated or upgraded to latest versions. You can also have them customized. I’ve used the service to change the speaker terminations on my speaker cables and also upgraded from a Plus series cable to a Super series cable.
Good luck with the sale!