Arturo Toscanini Austin Prod. 1968 Plaster Bronze Bust Mazzone

I came across this sculpture today and purchased it for a very good price. I know it's an Austin Prod. (Production) piece from 1968. There is another mark on it, it says "Mazzone 68." It does have some damage to it with some chips in the paint and the plaster.

I did discover it was a bust of the famous music conductor Arturo Toscanini.

Does anyone know what the value of this bust is? I may be listing it soon on eBay.