You will have to call Colt or provide the serial number.
1978
50-500 usd
january251910
1970
about 1978
Manufactured in 1978.
You will have to call Colt. That sn goes beyond what has been published.
'ACP' means Automatic Colt Pistol. A 1911, for example, would chamber a .45 ACP cartridge.
The .45 ACP--which stands for AUTOMATIC COLT PISTOL is used in semiautomatic pistols. The .45 Colt is used in revolvers.
You will have to call Colt. The sn you provide does not follow normal conventions.
50-500 usd