Impossible to answer without the serial number.
Remington Rand. Made 1943
You vave an Ithaca sxs Flues model made in 1911
http://www.sightm1911.com/1911Production.htm
made by Colt in 1918. your colt has an Ithaca slide, which often happens during cleaning
The Colt with that serial number was produced at the end of 1943 in Ithaca,NY as the year 1944 started with serial number 1235000.
made in 1912 by Colt for US Navy or made by Remington
your 1911 was made by Ithaca in 1943
Your serial number indicates that your Ithaca shotgun was made in the year 1920.
A model 37 with the serial # 10464 was produced in 1939.
Call Ithaca at 1 877 648 4222 and they will tell you.
1976