Michael,
Thanks for the very helpful photos.
2076 is a Replica of recent construction, reported to be underweight. Its origin is currently unknown. The original was destroyed in the 60s.
2112 has continuous history and is owned by Karsten LeBlanc.
2388 is a Replica, originally built in 1986. The original was destroyed in the 70s.
2468 (no 31) has continuous history, but didn't run for thirty years. It was severely damaged in 68 and rebuilt in FIA form in 98; not much of the original car remains.
RS