Bike puzzle : Find my age

[xxamr_corpxx]

I've purchased (another) bike this week, a second hand Avanti Monza. Unfortunately I have no idea what the age of the bike is.

*Shifters are integrated with the brake levers.
*Rear derailer is Shimano RX
*Rear cassette is 7 speed
*Brake callipers are RX
*7005 Alloy body

Any ideas?