I don't have reference by serial number for that era Colts. You may be able to aproximate manufacture of your Colt by the following detail. If you own the Government Model MK/IV Series 80, it began life in 1983 with serial number FG01000.
Does anyone know if there is a site that can tell you when my colt was made by the serial #? If you own the Government Model MK/IV Series 80, it began life in 1983 with serial number FG01000. They stopped making 38 Super. Then you get into the Custom Tactical Gov't Models Levels 1, 2, 3.
They stopped making 38 Super and 9mm in 1992. By 1996,.45 ACP with rubber combat style grips and rampant Colt medallions. Assuming yours is a.45 ACP, Blue finish until 1997, also offered in '97 were fixed white dot sights, Nickel finish until 1986, Satin Nickel and blue came with Pachmayr grips 'till 1996, Stainless 'till 1998, Ultimate Bright Stainless 1986-96, Limited Class 1994-97, Custom Comp. Model (Colt Custom Shop) 1994-98.
Gold Cup National Match MKIV/Series 80 in.45 ACP were also made between 1983 and 1996. Then you get into the Custom Tactical Gov't Models Levels 1, 2, 3. Combat series 80 for competition, carry models, Elites, Lightweights and the like. I welcome your inquiry and hope this helps. Feel free to make a small contribution to Pistolsmith.com via PayPal. A no prefix SN on a S80 sounds very strange.
Does it have Colt markings on the receiver? My OACP and 1991A1 Series 80s are both marked 'Colt Pt F.A. Hartford, Conn, USA' on the right side in small print between the top of the grip panel and the bottom edge of the slide.
Does it have the firing pin safety levers? They or their slot would be visible through the ejection port with the slide locked back, looking just to the right of the disconnector. If not, you have got a parts gun being passed off for a new Colt. A real Colt military receiver of that number would be a 1911, not a 1911A1 and would lack the crescent shaped finger clearance cuts behind the trigger. If not, it is not even made up on a real Colt receiver. Aren't there some 1911 copies being made in your country?
You might have a parts gun made up on a domestic receiver.