Lindner did source unfinished guns to a few gunmakers in America. The vast majority of his output was sent in finished form to Shoverling, Daly and Gales. Does your gun have crossed pistols under either a crown or "HAL" just ahead of the barrel flats? Does it have a very wide forerm lug? Is it hammerless? What is the serial number? Looking forward to seeing the pictures. Ken Georgi will probably provide you with more iniformation about Lindner's providing semi-finished guns to American gunmakers. Very few are around and he has several nice ones.
Cheers,
Jon