Olfa A-1 Auto-Lock Utility Knife with blade snapper, Model 5023

Olfa Model A-1 Auto-Lock Utility Knife is very similiar to the Olfa Model A Knife. 
Positive slide lock and heavy gauge stainless steel blade channel hold blade tight. 
It has the same high impact ABS plastic yellow handle. It still comes with a built-in blade snapper tool on the back, but it is now in black . 

Blade is made from high quality carbon tool steel is produced using OLFA's precise multi-step production process for unparalleled sharpness and superior edge retention. Long lasting durable snap-off blade - a new sharp edge with each snap. For right or left handed use.