Series 7 episode 48, "Divided We Stand," when Harold and Albert are watching football on TV if you look through the vents in the back of the TV set you can see straight through it. It has no screen. See more...
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The entry you are marking as a duplicate is:
|Title||Steptoe and Son|
|Original entry||Christmas Special 1974: When Harold is playing with the toy bus you can see the camera reflected in its windows.|