There appears a nerve hole just off-center in the 1:30 position.

If that was mine I would grind and polish the back.

For a definitive answer, email Dr. Kenny Craig. The man eats, sleeps and breaths ivory. He is THE nicest and most generous chipper I have ever met.

However, be warned. I was only interested in crest & seals at one time. That was 686 ivory chips ago.