Ah 
The old Dehaviland Dart Herald 
2+2 seating, with rows 1 and 2 facing each other across a table, so you could hold a business meeting during the flight - apart from the deafening prop-noise in the front half dozen rows !
Some were pressurised and flew (about I think) 15-20,000 feet, others weren't and you really got a good view of the scenery. Really
bumped in bad weather
Those good old aircraft with the "first stage compressor" outside the engine cowling
(British Island Airways, LGW to Manchester, Rotterdam and Guernsey - early 70's)