I think this rifle was Polish Government property at one time-crowned eagle stamp on the receiver.
This might be one of few(thousand?) that made their way to North America before WW2.
If you are referring to the "eagle" to the left of the serial number that is the German (Prussian) property stamp meaning the rifle was accepted into military service.
You see interesting variations of these eagle stamps between Amberg, Danzig (especially Danzig rifles), and Erfurt made rifles. For instance, the Danzig crown stamp, position of the receiver marking, and eagle style, are very unique and are not duplicated on any other Gewehr 98 made by another state arsenal or private firm.
A close examination of the right side of the butt stock, if the property stamps are intact, would indicate which kingdom the rifle belonged to.
George, thank you for the kind words and for chiming in on the rifle and her current condition. You are right, these old war horses were there, they fought in those battles that today we only read about. Owning a newly made firearm that goes bang, sure that may be fun, but owning a piece of history that was in those trenches, illuminated by those star shells at night, and covered in dug out dust dripping down from the creaking ceiling beams after a heavy shelling, that is something to truly behold and shoot.
The soldier(s) that carried that rifle are long gone but his (their) legacy live on in that rifle. She survived the disbandment of the empire she was built to serve and she may have been sporterized afterwards but make sure she lives on and continues to shoot

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cigarbufff, if you are curious, your rifle was the 266,565th to come off the DWM line in 1916. My estimate on daily production at DWM puts your rifle being made sometime between August and November of that year but don't quote me. The suffix letter indicates a very high production period that must have been at least 800 rifles a month or greater. Sadly, DWM's factory records were lost during WW2 so we will never know for sure.
If you want something that will really boggle your mind, have a look at the double suffix letter carbines made at Erfurt starting in 1916 up to 1918. This means they were producing close to 1000 or more carbines a day and assembling a complete carbine almost every minute!