You have a Knick model, named after the designer, Frank Knickerbocker. This design was introduced in 1922 and ran until 1988 when it was discontinued. The previous design, The Flues model, ended at serial number 399,000 in 1922, so your serial number places the manufacture date not too long after the gun was introduced.
1900
If you are referring to an old double barrel, it was made in 1919.
1910
Can't be identified with just the serial number. Provide a detailed description of all markings, caliber/gauge, barrel length, condition, finish, sights, stock, box, papers, accessories, etc..
Check the receiver.
Made in 1952
Made in 1969. Info from Ithaca Gun Co. serial number check chart.
To determine the age of an Ithaca double barrel shotgun with the serial number 895859, you would need to consult Ithaca's production records or a reference guide specific to their firearms. Generally, Ithaca shotguns were produced from the late 1800s into the 1970s, with serial numbers providing clues to their manufacturing date. You can also reach out to firearms experts or collectors for more precise dating based on the serial number.
You will need to provide a lot more information to get an accurate answer. For instance - do you know the model? The serial number? What kind of condition it is in? How is it choked? What grade it is (engraving on it or not, other markings, etc.)
The serial number is on the frame.
It appears that the Ithaca in question was made in 1969
Made in 1964