Originally Posted by T-Mar

Bikes11, yes it was manufactured by Giant in July 1982. I don't know how southern hemisphere model year introductions were timed but conceivably it could even be a 1983 model. The American model namesthat most members will be familiar with do not necessarily correspond with those Australia. The distributor for the local market selected them. For instance, there were differences even between Canada and the USA.

During this period Giant typically built the entry level models. This is supported by the presence of brake cable stops versus tunnels on the top tube and the absence of shift lever and water bottles bosses. In America, the 1983-1983 model year transition saw some entry level models switched from hi-tensile to plain gauge, chromium-molybdenum, main tubes. Yours could be either. The seat post size should tell us for sure.

It's a bit of a frankenbike. Typically, the rear derailleur is more likely to be replaced over the front derailleur, but ARx would be typical for this level and, to the best of my knowledge, no (American) model was spec'd with Shimano AX. If this was a USA model, the best candidate would be an Olympic 12.