It is an earlier single lever Heavy 10. Nothing at all wrong with that. Looks like it has a D1-4 spindle nose and I'm not sure that option was available at that time. Looking on the wall are some faceplates and they don't :appear" to be D1-4 items.
More pictures would help and a list of what is included (tooling, attachments, etc). Looks like, also, that it has been repainted. Thats OK too but it might be covering wear.
Thats a new looking 4-jaw chuck, and that is about $250-$600 depending on the brand.
Later- zooming up on the one photo I can't tell if what I am seeing is a D1-4 cam or if it is a chuck adapter bolt head????