vts1134, thre's no any news from you. Are you still interested in getting a 23LK1B for your Leningrad television?
This CRT is a dud but I got in contact with a fellow from a CRT rebuild shop and told him your wishes about originality. He's willing to save the original appearance of the CRT as much as possible while rebuilding: to keep the original gun by replacing only the cathode, to provide and guarantee a good lifetime without aluminizing, and so on.
But then I lost contact with you; you haven't responded to a number of my emails. We all guess that the rebuild shop won't last long...