Colt 1911-A1
Less than 100 to multiple thousands of USD depending on specifics.
The Colt 1911 A1 is rated at 395 FPS (Feet Per Second)
Made in 1945 in Ithaca for Colt.
1905, 1911, 1911 A1 were all predecessors.
1968
Your 1911 serial number indicates your 1911 was made by Colt in 1918.
I think you mean colt 1911A1 which was the US military handgun from 1911 to about 1985.
You can call Colt or visit their website which has sn data.
your 1911 was made in 1912 by Colt or Remington
Your 1911 was made by Colt in 1918.
made by Colt in 1918. not unusual to see a springfield slide on a Colt frame. value depends on overall condition. estimate $1500 plus or minus.