By the serial #
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.
No way to answer.
Blue Book of Gun Values
The New Ithaca Double models were first made in 1925, but the starting serial number for them was 425000. If it was a New Ithaca Gun (NIG), then it would have been made in 1890-91.
It was made in 1919.
5 years
1896
It sounds as if you have a Ithaca Crass model shotgun,that was produced in the year 1903 by your serial number.
With the serial number that you provided,your Ithaca double barrel shotgun with the damascus barrels was produced in the year 1900.
You will need to contact Ithaca. Published sn's do not go that high.
Around July of 1925
Need to know model