(guessing this was the one in LA for sale recently? Looked nice.)

Is the schematic labeled as being for Chicago Coin's Gun Smoke? There apparently was a version for export to Italy, but is probably rare to find here.

pbresource.com may be the best bet at finding another copy of the schematic (they don't list them all individually; will have to call or email them to ask).

Would guess as-is it's in the $200-$300 range; restored maybe double that. Really depends on the cosmetic condition. Chicago Coin pins aren't typically in high demand though.

Not very well. They were basically the 4th best manufacturer at the time. Very few people think much of the artwork style they used, even though some of the art was done by artist famous on other brands. Nor, did they typically do anything spectacular as far as playfield features go.

Originally, I always wanted to own a Gunsmoke due to both the name and the Gunsmoke button feature. It is similar to either a motorized flash bonus sequence like Bally used on some games or Spin and Score like on some Gottlieb games. But, with Gunsmoke, it is under your control to try to stop the light at the highest score. But now, I have gotten over the "want" and glad I never found one locally (one just showed up on CL for only $200 but I still passed). The funny thing about that is one of the ones I played as a kid (Magic Mountain) had a carriage bolt in place of the button. This was because the ball would fall in the hole and then wait forever for the player to push the Gunsmoke button. Many never did and just walked away thinking the game was broken. So, they defeated the one good feature about the game.

Casino is another old one that many people find rather fun due to the spinning disc like on Fireball. Much later, when there was another HUGE purchasing boom by operators, games like Blue Max/Red Baron and Hollywood/Cinema made good money and they sold a lot of them. Blue Max for the spinners that everyone loved to bang away at (even though they didn't spin very well compared to other brands). And Hollywood for the in line kick out holes. But by then, the build quality had gone way down for CCD (Come on - A Nutone Door Bell unit to replace the chimes!!! UGG). So many of us don't even want to work on them since the same bad parts are usually worn on all the games so needed parts are often hard to find.

Usually, technical design didn't vary too much on games made around the same time (same manufacturer). So, if you go to www.ipdb.org and then do an advance search, select Chicago Coin in the manufacturers pull down, and then search, you will get all the machines they made. Then, click on the top index tab for DATE and it will resort them from earliest to oldest. This will give you some more titles to look at made around the same time as Gunsmoke.

The coin credit, game reset, and standard scoring features should closely match as long as you are looking at a 2 player vs a 4 player or a single player game. There is where the design will change dramatically. But, as long as your schematic is for a CC Gunsmoke, it should match very closely.
I don't think CCD called out the reset sequence like others did in later years. And it doesn't appear anyone has gotten around to writing about it on pinwiki.com. I has been far too many years since I had my head in a CCD game so I can't lend much help about the start up sequence other than to study another schematic I might have.

Twinky, 9 months earlier also used the gunsmoke flash light feature so it may match fairly closely. the playfields even look rather similar and they are both 2 player games.

BTW, you might notice that CCD didn't design a lot of pinballs around that era. This is mostly due to the fact that their factory was busy makings some rather good arcade pieces for which their mechanical engineering was well suited.

If I remember correctly, on CC machines of that era, if a scoring switch is stuck in the 'on' position, it could score the point, go to the next ball, score the point, etc. until game over. When it advances from ball to ball is there one score reel in particular (one, ten, hundred point) that scores? That might give a clue to narrowing down the number of switches to check.

I don't remember if a stuck scoring switch could interrupt the reset sequence and do the same.
I do remember once working on a CC game though where a stuck scoring switch on the playfield caused the game to advance from ball to ball until game over when the ball hit the outhole.