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.
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.)
Made in 1964
It appears that the Ithaca in question was made in 1969
The serial number is on the frame.
The barrel and receiver should have the same serial number.