My Friend, I believe that's a LJ (as in Light jeep) series. Suzuki made the LJ models before the SJ's, they came in the following chronological order;
1) Suzuki LJ10
2) Suzuki LJ20
3) Suzuki LJ50
4) Suzuki LJ80
The LJ80 was the true predecessor of the now popular Jimny series. The LJ's defining characteristics were its round bonnet, large round headlights and an angular vertical 8 slot grill. The SJ introduced was introduced later on sporting a straight bonnet and front end. Sadly the LJ's were manufactured for a short period and thus are not that well known. If anyone's interested I can post pictures of my Dad's LJ80 that he rebuilt to its original specs.