Your bonsai is Ficus palmeri or Ficus petiolaris—nearly identical in care. These are rock figs with swollen caudexes, native to Mexico.
Study Jerry Meislik’s site: bonsaihunk.us—the authority on Ficus bonsai. His paperback book is a must-have.

With dedicated care, this becomes a stunning specimen.
Growing Schefflera and Ficus Outdoors in Zone 9
Ficus, Jade, and Schefflera Declining After Summer Outdoors
Identifying and Caring for Dianthus (Pinks) Sold as Houseplants
Correcting ID and Care for Sempervivum and Variegated Crassula
Bonsai: The Art of Miniature Trees in Containers
Plant Names Decoded: Botanical vs. Common Names for Gardeners
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