I have 2, had 3. 10mm, ported, a pair of 5" and a 6". Sold one of the 5's to a well known gunsmith.
The top end is Peters Stahl. At one time after the Springfield collaboration, they were building and importing or trying to import their own 1911s. Don't think this went anywhere but do remember visiting their booth at SHOT many years ago.
The dual extractors are unique, the right side is a significant hook, the left has a taper that helps to pull the cartridge out and keep it aligned but also releases or allows the cartridge base to pivot out on the ejector. The system allowed barrel changes for 9mm, 10mm and 45acp. 10mm was real popular with these guns during the 90's. The lock up was more like a Glock or S&W M&P rather than traditional Browning design 1911.
Parts for the top end are hard to find, the frame is standard 1911. Some of the parts could be made by a decent machinist. Extractors are the biggest problem and potentially the hardest to make. Wire EDM would be the most likely manufacturing process. Barrels would be an issue but fortunately it will take a lot to wear them out. The barrels do have polygonal rifling like the Glocks.
I'll try to help if there are questions. No idea as to current values, I think I got $750 about 15 years ago for the 5" I sold.
Jim