I've been looking at a Parker Trogan at the LGS the last few days. I don't really know enough about them to ask an intelligent question, so I'll tell what I do know.
The S/N is 205xxx. 28" barrels (uncut), twin triggers, extractors, Hard rubber butt plate. It has been refinished. No dolls head, but lockup seems tight. It looks like an old, well worn, but well taken care of field gun. On the right side of the frame, and right side of the stock there are wear marks, right where I would expect them to be if a man carried it in the crook of his arm.
The GBC (guy behind the counter) checked it with a gauge he had and said it has "short chambers" and was choked modified and full. I understand "short chamber" probably means 2 9/16th?
Right now, it looks "old" but I think a lot of that may just be that it hasn't been wiped down recently. The bores were filthy, so I asked the GBC to give them a lick and a promise cleaning, which he was glad to do. The interior looks good and shiney. No pitting inside or outside that I've noticed.
One thing I really liked is that it seems to jump to my shoulder. Even my wife who knows nothing at all about a shotgun commented on that. "That's neat the way you snap it to your shoulder like that." I laughed and told her that once in a while, I can fool people who know nothing into thinking I know something."
Anyway, thanks for letting me think outloud. I'll shut up now.