Not much anyone will be able to tell you here, especially without photos. Even then, these requests often end up in circles of speculation and guessing, and taking far far far far more effort than if the guitar were just viewed by a professional in person.
1) Yes tuners can usually be maintained, but are often among the least likely causes of an instrument not staying it tune.
2) Saddle - If it needs a new one, it should be bone. If it were a vintage piece actually worth putting ivory in (which it likely is not, and probably never used it to begin with), then it would be a case worthy of using real ivory. I can't imagine a case where a laminated piano key ivory saddle would be desirable.
3) The best way to identify it is to have someone who really knows (like an appraiser) look at it in person. So many factories built for so many names and distributors, and built such similar styles. Sometimes you can narrow it down to a decade and a factory like Lyon and Healy, or Regal, or Weymann, sometimes you can't. There aren't any good books I know of that cover the broad range of identifying catalog instruments. I'm not sure why you don't want mention of George Gruhn's reference book - t's still about the best reference out there for major brands, though I know most catalog instruments aren't covered.
Last question - take it in to someone, in person. From here I can say it's probably worth between $1 and $100,000 - probably - can't say for sure though. I know you were looking for more serious advice, but it would be uninformed. Even if well intentioned, uninformed advice can be more damaging that good at times, and that's all the advice that can be offered from the information we have.
_________________ Eschew obfuscation, espouse elucidation.
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