configuration starting in 1917 and were used in WWI where they were much hated by the Germans....no surprise since an American soldier armed with one could run 6 rounds through it sending 12 .32 caliber projectiles down a crowded trench and then mop up with the 18" 1917 "sword bayonet" that the gun was equipped with...it was so hated by the Germans that they actually petitioned the Hague and Geneva Conventions to "outlaw" it as an "inhumane" weapon....(this from the people that gave us mustard gas)....
If your gun has the 30" barrel then its not the "trench" model....those guns will have a 20" barrel, a barrel "heat shroud", (6 rows of ventilation holes if its was mfg'ed for WWI and 4 if it was made for WWII), sling swivels and a bayonet lug. The gun found great favor with the police after its success in WWI and was marketed in a RIOT configuration up until mfg. ceased in the late 50's....that gun will have the 20" barrel but will not have the bayonet lug or the heat shroud.....
12ga. guns in "factory" condition will have 30" barrel with full chokes and can be either the "non-take down" or "take down" models....16 ga. guns will have a 28" barrel. If your gun has a full barrel length magazine extender then it might have been used in some "high volume" shooting situation....the early market hunters added these in alot of cases.....date of mfg. would tell you whether this was in a "legal" or "non-legal" application....
Some small changes to the gun over its million gun run....forearm design changes from the short, "corn cob" design to a longer "flat sided" design in the later years and the blueing color changed.....
Dangerous to shoot?....the gun has an exposed hammer and is not more inherently dangerous to use than any other "exposed hammer" gun.....carry it "cocked" and "yep-its dangerous as hell" just as a modern weapon carried with the safety "off" is dangerous.....carry a "sound" gun with the hammer on "half cock" and its as safe as any modern gun with a safety. Carrying a gun on "half cock" does require that the operator bring the gun to "full cock" to fire but this takes only a little practice and as long as safe gun handling rules are followed the gun is no more dangerous than any other gun.....
This "assumes" that the sear that holds the hammer at "half" and "full" cock positions is not worn which can allow the hammer to "slip".....this can be checked by bringing the hammer to "half cock" and then slipping your thumb under the tang of the hammer and trying to force the hammer to slip.....the gun should, of course, be unloaded, and the muzzle pointed in a safe direction.....if the hammer cannot be disconnected from the "half cock" then the same procedure should be repeated at "full cock".....if that test is successful then the gun is safe to shoot as far as the hammer assembly is concerned....
Can't help you on the parkerized finish other than to say "I'd think it could be removed"....frankly I wouldn't mess with it since the value of the gun is already reduced by the application and removal and re-blueing won't result in an increase in that value.....shoot it "as is" and enjoy it as the piece of history that it is....
One last "interesting" note on the '97.....the trigger mechanism has no trigger disconnect which allows the gun to be fired by holding the trigger down and pumping the action...the gun fires with the completion of each foreward stroke.....this is called "slam firing" and was much appreciated by the soildiers that used the gun in close combat in WWI, WWII and Korea......(Model 12's also have this "feature").....
Steve
Steve