What year was an AYA shotgun produced with a serial number of 524948?

The answer can be found in "Spanish Treasure" by Terry Wieland. According to this guide, the gun #524948 was produced between 1978

• 1983. Your gun will have a date code stamped on the barrel flats.

To determine the exact year of manufacture here is a list of the codes: 1978 - X1, 1979 - Y1, 1980 - Z1, 1981 - A2, 1982 - B2, 1983

• C2