Those look to be similar to the SL-M series, the SL-M1 and SL-M2 in particular. They also came in both p-mount and s-arm versions (depending on the nation for which they were destined), had similar rumble specs, and fully adjustable tracking force and antiskate on the p-mount versions. The difference would be that the SL-M models had a plinth of rosewood vinyl over MDF, and the two I have (SL-MA1 and SL-M3) are not suspended.