| Image | | | | | Summary |
 | SMC D Locking v1 | D | manual | nose stopped - longitudinal interferance | vintage screw locker from an era when lockers were a luxury |
 | SMC D Locking v2 | D | manual | other stopped | bi-directional locking due to full length thread |
 | SMC D Locking v3 | D | manual | nose stopped | budget screw locker from an era when lockers were a luxury |
 | SMC Oval v1 (Orange) | oval | n/a | n/a | early unrated milled-nose oval in orange anodization |
 | SMC Oval v2 | oval | n/a | n/a | early unrated stamped-nose oval |