If anything, buy it for an investment. A Belgian Light Twelve (I have a 1968 version) is a thing of beauty and a tribute to the gunmaking genius of John Browning.
The 12 gauge A-5s are a bit heavy and clunky for dove or quail, but for ducks or clays, they're fun.
Some will swear the A-5 is not reliable, but if you set the rings up right, it is very reliable with the loads it is set up for. The rings inside the forearm can be arranged for either light or heavy loads,. Neat, huh?
My brother has a 20 gauge A-5 and it is a very good dove/quail gun, indeed.
I'd say, if it appeals to you, buy it. They stopped making A-5s in Belguim in 1976 and stopped making the Japanese ones altogether a few years ago and its likely we'll never see A-5s produced again.
Its a classic...go for it!
-Brickboy240