After taking a closer look at the photo in the original post, it is clear that this is not the knife that flew on Liberty Bell 7. Although the LB7 knife was remarkably well preserved after spending 37 years at the bottom of the ocean, 16,000 feet deep, it was still in pretty rough shape when it was recovered. It required a lot of restoration, and it had a lot of pitting all over. The knife in Indiana shows no signs of either the pitting or having been restored.

As an aside, the Grissom family was NOT happy with the recovery of LB7. They did not want the capsule's recovery to rekindle the old argument about whether Grissom panicked and fired the hatch prematurely, and consequently damage his memory and reputation as an astronaut lost in the service of his country. Personally, I don't believe this has happened. If anything, the capsule's recovery rekindled the public's memory of these heroic astronauts and the sacrifices they made for their country.