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[Terry]

Some of the later sets were restricted to about 7Mhz.    

They would have been designed for use with the Belgian System F transmissions which shoe horned an 819 line signal into a 625 line channel!
The differences between the French system E and the Belgian system F are as follows (all figures in MHz):

System E: Channel width: 14  Vis. BW 10.4 Sound/vision spacing: ±11.15  VSB: 2 
System F: Channel width:   7  Vis. BW  5.0   Sound/vision spacing:   +5.5    VSB: 0.75

Any set designed for use in France would have to accommodate the 11.15MHz sound/vision spacing, so there would be no point in truncating the vision IF bandwidth.

I wonder how many sets, of any age, were capable of resolving the full 10.4MHz bandwidth?

This brings back memories of seeing two narrow (half 819-line) pictures side by side on a 405-line set during periods of abnormal reception in the 60s ...!