Mid-Century Modern Cognac Brown Leather Alky Chairs by Giancarlo Piretti, Italy, 1970s. Mid-Century Modern Cognac Brown Leather Alky Chairs by Giancarlo Piretti, Italy, 1970s. This set of 2 cognac brown Alky chairs in original leather upholstery was designed by Giancarlo Piretti for Castelli in the 1970s. The Alky chair is a stunning example of mid-century modern design, featuring a sleek, minimalist silhouette and luxurious black leather upholstery. The chair's frame is made from polished aluminum, which complements the leather upholstery and adds a touch of seventies chic to the overall design. Giancarlo Piretti is a renowned Italian designer best known for his innovative designs combining form and function. The Alky chair is no exception, as it is stylish and comfortable, making it the perfect addition to any modern living space. Overall, the Alky chair is a timeless piece of furniture that embodies the elegance and sophistication of mid-century modern design. This piece is attributed to the mentioned designer/maker. It has no attribution mark and no official proof of authenticity, however it is well documented in design history. I take full responsibility for any authenticity issues arising from misattribution