I decided to look up the manufacturing date of my stainless Ruger MKII 22lr.
Ruger has a Ruger MKII serial number by manufacturing year date chart: Mark II Pistol
My serial number is 212-92XXX. Which according to the chart was made in 1987. However, my records, I purchased the pistol new, from a local gunshop 8 Oct 1986. Price was $225.00!
The pictured pistol did not come from the factory drilled and tapped for an optical sight, that was something I had done later.
Anyway, I suppose all these databases have a little plus or minus. Maybe the error is due to the ancient technologies in use at the time: in 1989 the Motorola made the first flip phone (MicroTAC). Before then, we communicated with drums and smoke signals and wrote on clay tablets.

Ruger has a Ruger MKII serial number by manufacturing year date chart: Mark II Pistol
My serial number is 212-92XXX. Which according to the chart was made in 1987. However, my records, I purchased the pistol new, from a local gunshop 8 Oct 1986. Price was $225.00!
The pictured pistol did not come from the factory drilled and tapped for an optical sight, that was something I had done later.
Anyway, I suppose all these databases have a little plus or minus. Maybe the error is due to the ancient technologies in use at the time: in 1989 the Motorola made the first flip phone (MicroTAC). Before then, we communicated with drums and smoke signals and wrote on clay tablets.