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If this is the company, they say on the website that since they stopped manufacturing clothing, they are focusing on the sale of leather, wool and cloth of all kinds.
The jackets are still around, though. It's not too hard to find a nice one on e-bay (belted models offset zips and motorcycle blousons). (Price point: about € 150 for one that's it really good condition even if 40 years old.) Most Haelson jackets seem not to have been labelled as such; they often come with labels with (no longer existent) store names. They tend to have a tight fit, and the sleeves are longish (perfect for me, about 2 inches longer that Aero, say).