The Tektronix 7M11 is a dual 75 ns 50R delay line, 175 ps rise time, with selectable trigger pick-off. It is completely passive, hence can be used stand-alone or in a plugin slot of a 7000 series oscilloscope. Tekwiki has more info.
Note the old-school General Radio Type GR 874 connector. The first delay line has GR874 to BNC mating connectors plugged in.
The General Radio Type GR 874 connector, adapters and attenuator. It is hermaphroditic, interesting!