The Ithaca brand shotgun was manufactured in New York. I don't know if this is the one you were looking for.
Ithaca Firearms manufactured the Lefever Nitro Special shotgun with serial numbers between 101600 and 119899 in 1922.
It your shotgun a Model 37-S or 37-T ?
The shotguns were manufactured by Ithaca from 1921 through 1947. Yours was manufactured in 1928.
Ithaca SN 68814 was manufactured in 1902 according to Ithaca Gun Company records compiled and released in 1960. It is a Lewis model if hammerless and New Ithaca Gun if it has hammers.
You may contact Ithaca arms and they will date your shotgun for you.
if this is the correct serial number ending in "560" it was manufactured in May of 1860.
Depending on the condition of the gun, it can go anywhere from $800 to $1500. The serial number indicates that the shotgun was manufactured around 1902.
Your serial number indicates that your Ithaca shotgun was made in the year 1920.