"Welcome to Marble Connection"
Agree with Navarre for the I.D. yes, that is a pontil on yours, Navarre are single pontil marbles. Glad you decided to post, keep em comin !! A link w/ a little marble history for ya and an explanation of how, whom, where & when Navarre (Leightons) were made .
LINK : https://oldraremarbles.com/product-category/leighton/#:~:text=Collectors call his marbles “Navarres,in most – Navarre%2C
Found a few for sale on Ebay for ya to take a look @ if you'd like ?? Some are probably miss I.D. as usual on the Bay
LINK : https://picclick.com/Toys-Hobbies/Marbles/?q=navarre+marbles