Tesla model 4001

[W3XWT]

"... First Czechoslovakia TV receiver, when TV broadcasting was started in 1. 5. 1953. It would have used the system that became PAL I think."

The color would've been SECAM which is what was used by the USSR and its European "clients" until PAL was adopted following the "change in management philosophy"... That also explains why regular broadcasting started on the first of May, the socialist Labor Day holiday.

I'd also look inside for other "tweaks". Beginning with the 6.5MHz video/audio carrier offset because when I visited what was then Czechoslovakia (while living in Austria), most of the TV antennas I saw were aimed towards Austria! I bet more than a few TV repair techs, ham operators, etc., supplemented their official income by doing "re-alignments"!