I thought it looked to good to be a kit. The lock has English threads, so I assume it was made in USA. It's hard to see in the photo, but the most detailed work is just above the ramrod. It is cut and carved, like something you'd see by a very accomplished builder. The "weeping heart" is brazed on one side to the barrel pin, and slides into the opening on the heart, on the opposite side. Another mark of an experienced builder. The pistol has never been fired, but it sparks well, and when this wind dies down, I'll see what she'll do.
Thanks to all for information, and comments.