SM stands for Schepis Model. The Boss engines were made in the GRP Gandini factory along with Mario Rossi. These were made for Schepis Model and utilized the SM BOSS branding and were distributed by Schepis Model.
| Variant | |
|---|---|
| Type | Private |
| Parent Company | N/A |
| Founded | December 10, 1940 |
| Divisions | SM BOSS |
| Headquarters | Contesse - Messina |
| Status | Inactive |
| Website | Click |