I would suggest checking gunbroker.com or gunsamerica.com to get an idea of current asking prices. Asking prices & selling prices can be very different.
what is the value of 12 gauge skb double barrel ithaca 1900 model
It sounds to me that you have a Ithaca Flues model double barrel shotgun.With the serial number that you provided,your shotgun was made by Ithaca in 1917.
You have an Ithaca Miner model made in 1907
double trigger and hammers
A Model 37 is a "pump", so a double barrel could not be a Model 37
Sounds like this is a "New Ithaca Double". Depending on condition, I see these selling for $350-$500 on Gunbroker.com.
You have a Flues model, built with pride in 1920.
$317
The Ithaca Hammerless 12 gauge double barrel shotgun with the serial number 122327 was likely manufactured in 1914. Ithaca Gun Company produced these shotguns from the late 19th century into the early 20th century, and the serial number can help pinpoint its production year within that range. For precise identification, it's always best to consult production records or a firearms expert.
It was the Auto/ Burglar gun in 20 Gauge.
Numrich Gun Parts Corp. online at ww.gunpartscorp.com
Double barrel? Single barrel? Model? Need more information in order to be able to answer.