HMV 900 , Pre War Television 1936 , showing the Baird 240 line system and EMI 405 line system 

These are the first tests of the HMV-900 after restoration. The video shows it running on the Baird 240 line 25 frame system ( which flickers ) and on the EMI 405 line 50 frame interlaced system. These are thought to be the first time the television has given a picture for over fifty years