That looks like a serial number but Avondale clearly showed the date in their's, normally the plate is above the door inside and second and third digits are the year.
From 92 on, the CRIS number, or VIN, came into being and is etched on all windows in bottom right corner, second line starts with maker, 'AV' in your case, 3rd digit is year starting with 'N' for 92, no O or Q so 'P' is 93 etc, a number replaced a letter with '1' in 2001.