Unfortunately, this company doesn't appear to be in existence today. These "pearls" were perhaps from the 1920's. There appears to be some peeling around the holes. Can you see peeling and scratches when you look closely at the pearls? And a bead under the coating? They appear to be imitation pearls. Consider having them restrung and knotted between if the pearls are in good enough condition. If you have the insert piece to the clasp it could be reused, too, as it is lovely.
The box and "Guarantee" are interesting. Have these pearls been in your family for a long time?