Is it 45 ACP or 45 Long Colt? Single action or Double action? Barrel length? Finish? Need to know in order to answer. Depending on what you mean by "original registration", it may not exist.
Depends on condition, accessories, box, papers, etc.. Range 300-700
You can find out at Proofhouse.com in the Colt tables.
The numbers that go into 45 are 1, 5, 9, 45
9, 15, 45 are the composite factors of 45.
Proofhouse.com has Colt serial numbers you can look up
Please follow the link below for searching serial numbers of Colt firearms.
Find them at proofhouse.com.
Proofhouse.com has a list of serial numbers that can help you.
Go to proofhouse.com
The Colt model 1911 commercial .45 with serial # 70G67301was produced in 1974.The serial numbers in 1975started with 70G73001.
Around 1916
Colt 1911 .45 serial # 171885 was manufactured in 1917.
proofhouse.com
Your colt model 1911a1 was made in 1945,plus the serial number puts it in the range of the Remington rand numbers in my references.
You will have to call Colt to find out.
if there are no barrel markings......how do you know it's a colt ??