Comments and questions regarding a vintage Omega watch

After my father in law passed away, my mother in law gave me his watch to use and pass on etc. It's an old automatic Omega Seamaster De Ville. I'm guessing that it's approximately cir. 1960's to 70's. There are not that many markings on the case as shown in photos. The only available markings can clearly be seen on the face of the watch, the engraved "Sea Master" logo on the back, and it has "14k G.F." and "Stainless Steel Hinge" written on the clasp.
I was considering putting on an alligator skin wrist band and wearing the watch (I'm not crazy about the gold colored bracelet)

Can some of the watch enthusiasts on the board please help out with questions that I have?

1. How much is this watch worth?
2. Is it solid gold, or gold plated?
3. Is it possible to get the exact age?
4. I would like to get the watch cleaned & serviced, is it worth it? Approx. how much will it cost? Do I have to send it to Omega to have it done?
5. When serviced, I would like to replace crystal because there are some minor defects on it. Is that a bad idea? will it ruin the value is it better to remain original (assuming the watch has substantial value)?

Thanks for any help, additional comments and thoughts are welcome. Thanks!
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Thanks for the info guys.
By the way, I don't have the paperwork for it at this time, they may eventually show up though.
I have to agree about the strap, I really do not like the gold bracelet on it (I feel like it's tacky, just my personal opinion). I decided to go with a black alligator strap with the gold push button deployment clasp (like the one pictured below). With the alligator strap, I will be able to wear it and I'm sure that's what my FIL would have wanted. I'm not looking to sell because I definitely want to hand it down the generations (I really don't have any other heirlooms), but it would be nice to know how much it cost when it was new, what it's worth now, and it's potential future value just out of curiosity. I know they made a ton of them, so I don't expect the value that high.

At this time I decided to have it overhauled and the crystal replaced. I found a local watch repair place that will do it for $250-$300 (I will get an exact estimate after they see the watch).

I'm hoping that it's a 1968 or a 1970 model since it's the year of my and my wife's birth.
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Thanks! I'll keep you guys updated on the progress of course.
I already asked them in the work order to give me all the movement #'s etc. printed inside the case, but I like the idea of a photo. I'll have to let them know after they give me an exact price.

 

Update:
I found out that the watch is a 1952 model.

Other than finding out the date of the watch, not very good news unfortunately.

The estimate increased SUBSTANTIALLY from the initial $250 - $300, and did not seem like a good deal any longer. The total after tax was $768.02!
They claimed that they needed to rebuild the self winding mechanism, and replace the main spring. In order to do that they needed to hand make discontinued parts.
Then they wanted an additional $99.99 for an original crystal and another $49.99 to "replace all seals and gaskets"
and another $99.99 to polish the case and band!
Needless to say, I didn't do the full service. I then asked if they could leave everything alone and just give it a cleaning and oiling. They said that they wouldn't touch the watch for liability purposes unless I did the full overhaul service.
None of that sounded right to me since the watch seemed to work perfectly before I gave it to them, so at this point I asked for it back and my plan is to clean it up the best I can, and change the band myself. In the mean time, I will keep my options open and look for a place that may just give it a good oiling.
Does this all sound typical, or are they just trying to take advantage of me?

 

It was an independent! I know that the factory already quoted me approx $500 - $1,000 depending on what it needed.
I did find another place that came highly recommended on the vintage watch forums. His prices are WAY less than even my original quoted price.
I have the wait about a week or two for the watch to be sent back to me and I'll update this thread with my next move.... Probably send it to the place that had a recommendation.

 

I'm very torn because it's not my style watch at all and the only reason that I want to service it and wear it a little is because it's an heirloom. If it's too expensive to service, I'm going to do exactly as you sugggrsted, but if it's under $250 or $300 total, I'm going to overhaul it so it stays in good condition for the future generations. And since I love watches, I'm hoping to transform it into something that is cool and wearable. I will keep everyone posted!

 

I got the watch back from the "rip off place" and I am sending it to this guy:
https://www.watchdoctor.biz/Default.aspx
He came highly recommended on the vintage watch forums so he should be the real deal.
If the watch doesn't need any extra work, it will be taken apart, cleaned, oiled and polished for approx. $85!! (plus shipping)
I'm sending it out tomorrow, I'll keep everyone updated on the progress. It should take a few weeks to get it back.

 

I sent the watch out on Friday. The place should receive the watch on Monday or Tuesday (3/9 or 3/10). He will then look at it and tell me if it needs anything additional. I will definitely update you guys and also let you all know how happy I am with his service and prices.

 

I posting an update just to let you guys know that the overhaul on the watch is already done!!
Apparently the watch didn't need any parts or extra work so the total was $85 plus $20 for return shipping. I feel like that is a great price with fast service! I will update this thread once I get the watch in my hands and see how it operates and looks.
He seems like a VERY easy to work with guy. He also sent an e-mail saying that he will give $10 off to any new customer I refer (plus I would also get $10 off of my next repair).
I will keep you guys updated once I get the watch back.

 

Out of curiosity, why doesn't he work on chronographs? What did he say?

 

I got the watch back today.
I feel like he did a wonderful job!
It looks great and it works great. I replaced the band with an alligator band and I really like it now. It has a nice vintage look, but matches my style a little better. The watch looks brand new!
I definitely recommend Mark Sirianni to anyone who needs service on their watch. There was great communication, he was fast, and his prices were more than fair. I was very impressed with how fast I had the watch back in my hands. Here are the photos:
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Thanks! I'm very happy with the results. I'll probably wear it every now and then. I'm sure that's what my FIL would have wanted.

Amazon.com: 17mm Alligator Grain Leather Watch Band Strap Gold Push Button Deployment Clasp Color Black: Watches

I have to agree with the one review that says that the strap is a little stiff. It's a little annoying, but then again, it's the first day that I'm wearing it. It may improve as it breaks in.