The 1700 works hard in the Princess, I'm told the 1800 B is a better engine and there are articles from back in the day questioning why the O series was developed since it was apparently not much of an improvement over the B in terms of performance. Definitely a series 1 car, you can tell from the dashboard design, stubbier interior door arm rests, and the full width trim on the boot. Get your suspension checked and regassed at your earliest convenience, I keep meaning to get mine done and things keep getting in the way of it happening. Don't be surprised if the rear pivot shafts are totally seized in place when you try and remove the rear displacers, TADTS.
Happy to help in any way I can. OKK did drive remarkably well given the high mileage and general condition of the thing and was surprisingly solid for the most part, a shame it ended up parted out after a couple of ownership changes. It had extremely comfortable seats.