welcome JG !
Nice instrument in a popular colour by a good maker, possibly from the late 1950s to early 1960s, but not one of their upper shelf models.
Still, quite good for a beginner or amateur player.
Measure the distance between the outermost edges of the outermost white keys: if around 17 inches, it's a youth's, ladies or beginners model.
If around 19 inches, a full size model.
The picture is a little fuzzy, but it appears to have 3 voices (Low, Middle, Middle) and probably a vibrato ( or "musette ") tuning.
Similar accordions by various makers regularly appear in online markets in Australia at asking prices ranging from around $A500 to $A1,000+, depending on working condition and how long they've been without an offer .
Check out the local listings ( Google "accordion for sale near me ") in Facebook and gumtree for an idea of the market.
Just remember, these are asking prices only (and they can be very slow movers)