My bet is that it's the Standard Model (though it's probably stamped "Ruger .22 cal. Long Rifle Automatic Pistol" on the left side). These are often refered to as Mark I's - but that's not entirely correct since the Mark I's were target versions of later production Standard Models. It's definately not a Mark II.
The Ruger Company website will give you a date range by serial number. The next thing you need to do is pop off the grips and look for a frame number (should be stamped on the left side). This will be important if you want to replace the grips, spare magazines & obtaining other parts or accessories. Just looking at the location of the bottom screw on the right grip panel, it looks like it's a pre 1970's model (will not accept the newer Mark II grips). If the loading button on the magazine is on the right side, that's also an indication of an older model.
Once you get the manufacture date, and the frame number - go to the Ruger Forum (rugerforum.com) - Rimfires Long & Short topic area. With this information the folks there will be able to tell you whatever you want to know about your particular pistol.
I wouldn't count on it having much collector value - but they're great handling & shooting pistols - and you should have a lot of fun with it. If there is something that needs to be fixed, Ruger still works on them - and I hear at very reasonable prices. They may also be able to provide you with an original owners manual.
A word of caution about taking it apart (removing the barrel/receiver & bolt from the frame). If you are not familiar with Ruger .22 autos, getting it back together can be a challenge. A common characteristic of all Ruger .22 autos - and takes a few tries to really get it figured out (an owner's manual is helpful).