Tom welcome to a truly great forum.
If you go to the home page and look on the left side there are several headings under "collectors information" that will answer most of your questions including grade and year of manufacture.
What you have is a lifter model and a nice one at that.
As for the type of wood it is walnut.
While it is possible to refinish Damascus barrels it does require some knowledge and skill.
Since you didn't list where you live it is impossible for a member or associate that lives near you to give you any help.
Do have your gun checked by a gunsmith but, not all gunsmiths are well informed about Damascus shotguns and most will probably advise against shooting it regardless of it's condition.
Good luck with your quest.
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Proud father and grandfather of United States Marines!
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