So here are the two bones (brown one is a copy) for comparison. The new bone is much larger and very robust. It still shows the typical hollow ends, indicating the bone has a cartilage end, not a bone end. The brown band across the large end is a crack in the rock, filled with calcite. I've decided to leave it as-is, though with 4-6 hours work I could take it out and glue the two pieces back together.
So here it is in all 4 side views.
Here's the end view of the large end - really massive!
Sincerely, Greg Carr