You have a .38 S&W caliber 3rd model made 1911 in Fitchburg, MA.
The plastic grip plate shown is an old Franzite or other aftermarket grip, which would hurt value to a collector, and these are not much sought after by shooters as the ammo is semi-obsolete, so value maybe $100 plus or minus.
To satisfy my curiosity, what's written on the folded paper note between the grip and mainspring?
Thanks so much for your reply. The note in the handle was discovered when I removed the grips to look for the SN. It actually brought tears since this gun was handed to me by my late father-in-law who passed away a couple of years ago. The note simply was his name, address and phone number, in his han-writing. I guess he placed it there a number of years ago as identification.