Check the barrel codes for date of manufacture. Details on the Remington Society of America here: http://remingtonsociety.com/rsa/questions/barrelcodes Based on the serial it would be 1917, but the date code would be more accurate including the month.
1916
made 1910
Made in 1914
Manufactured 1915
1916 - pre-date coding.
Remington firearms are dated from a 2 or 3 LETTER code stamped on the left side of the barrel, very close to the frame. The Remington Collector Society webpage has the table of letters and years.
Try this link from Remington. http://www.remington.com/library/history/firearm_models/shotguns/model_10.asp
Try this link from Remington. http://www.remington.com/library/history/firearm_models/shotguns/model_10.asp
Poor time to use x's... 425 and down 1915 over 1916.
Manufactured late 1918
1907-1929, 100-375 USD
10a+a