Thank you for contacting Mearto. This is an ivory cat figurine either from Japan or China. The marking on the base “山又” is probably a name and “一” means one. This kind of signature could be used in China or Japan.
Below are some hammer prices for similar pieces to give you an idea of the market. Make sure to check into the laws regarding ivory sales in your state if you intend to sell the piece.
Please let me know if I can be of further assistance.

$50
https://www.liveauctioneers.com/item/12028845_181-chinese-carved-ivory-miniature-cat-netsuke

$65
https://www.liveauctioneers.com/item/24109503_carved-ivory-cat-figure-1-h-2-12-l-34-w

$70
https://www.liveauctioneers.com/item/850588_5433a-netsuke-ivory-sleeping-cat-2-12-l

$150
https://www.liveauctioneers.com/item/22822449_ivory-cat-carved-netsuke-on-wooden-stand

$160
https://www.liveauctioneers.com/item/41125049_cats-on-a-rug-old-japanese-ivory-natsuke

$170
​​https://www.liveauctioneers.com/item/15705922_japanese-carved-ivory-netsuke-cat-and-mouse

$175
https://www.liveauctioneers.com/item/12078838_417-finely-carved-ivory-okimono-cat

$200
https://www.liveauctioneers.com/item/22822451_carved-ivory-cat-netsuke-on-wooden-stand

2 for $400
https://www.liveauctioneers.com/item/9351973_1481-2-ivory-objects-cat-and-frog