Hi Paul,
Thanks for posting. I wonder who "will may just disagree."
I spent a lot of time round D7s of all descriptions and they were and are good tractors.
One of my claims to fame was when a pin came out of a governor weights on a D7E, it dropped into the timing case and took two teeth off the camshaft gear.
The gear is all in one with the shaft and a replacement at the time, (1968), cost what they paid me in wages for six months work. I was asked if I could repair it. I said "No Way" but ended up building up the two teeth with weld and dressing them up as best I could. I put it back in the engine and it was miraculously still running when the tractor was sold six years later.
Below is a interesting comparison of a Fowler 33 (125hp.) and a D7E (160 hp.) on the same work which I lifted from the Robert Fearnley website.
I've been trying to recognise the Allis Chalmers behind the Leyland unit in the black and white pic. I looked after five HD 16s for a couple of years and later used to run a 21P (power-shift) myself but I'm not sure what model is in your pic, from the position of the exhaust, air-cleaner and air pipe under the hood I think it may be a 21.
I'm sure I've seen the sun roof on that D7 before. Could it have been at the Allora show a few years back