Looks just like a Japonica. It may smell vaguely like a quince. If it is tart and the seeds look a bit like apple seeds, then go for it and make some jelly. It is delicious.Use a quince jelly recipe.
Unfortunately, it's just a small bush I saw at the side of the road at the edge of a paddock and there were only four or five fruits at most. I was driving down some side streets while in town and noticed them. Maybe I'll try and save some seed, but I doubt the bush in question will ever produce enough fruit.
If the bush has fruit on it still next week so I can identify it, I'll mark it and take some cuttings for grafting later on.
Without the size or a pic of the plant, but I would guess as Japanese quince - no relative to other quinces, it is on a bush that has usually beautiful pink flowers over summer
if is it needs cooking. The only time I have had It was in Poland when they made into a syrup and served it into tea, instead of sugar . It had a fragrant taste.
The shrub is usually grown as an ornamental as its flowers are rather lovely (look like wild roses) and the fruit is a bonus. The shrub is low growing but spreads out a little. It has some spines on branches but no worse than some lemons get. Right time of the year for ripe fruit. scientific name Chaenomeles and there's a nice pic of the flowers on wiki.