Comparing the CRT mask in your set to the one at the ETF:
http://www.earlytelevision.org/kuba.html
Yours looks to be an earlier model. The squarer the corners the newer the CRT.
Looking at your cabinet it would appear the majority of the TV electronics occupied the middle of the bottom unit. If you still have the TV electronics from the bottom unit then the set will be most original if you get a CRT and yoke and mate those to the original TV chassis if you have it.
Try to find the schematic for the TV section. It should have a part number for the CRT. Look up the CRT datasheet and keep a copy. Odds are there will be an American CRT with a similar screen size and the same deflection angle that can be bolted in. There should be a deflection yoke similar enough to work available too.
I know it is probably a euro standard TV chassis, but these days it is pretty easy to work around that. Euro standard RF modulators are cheap and it should be easy to readjust the hold controls to sync to NTSC fed into one of those modulators.