Luxury Swiss watchmaker Longines and its celebrity ambassador Kate Winslet have partnered up once again to introduce an exclusive new watch collection. The collaboration has produced several striking timepieces since the actress signed on in 2010, but this one is uniquely significant.

The Flagship Heritage by Kate Winslet was inspired by an original Flagship model, and is offered in gold as a nod to the Golden Hat Foundation. In fact, the proceeds from the sales of three of the watches will benefit the Foundation, which Winslet co-founded in 2010. The Foundation works to alter public perception of those with autism.

Not only does the limited timepiece collection support a great cause, it’s incredible luxurious too. The 35mm ladies timepieces features an 18-karat gold case, a white dial, and a camel calf-leather strap. In addition, it boasts a caliber L609 self-winding movement with a 42-hour power reserve.

“I was given the permission to choose a watch, which was designed specifically for the Golden Hat Foundation. The style of the model really appealed to me and I instantly fell in love with it,” said Winslet.

Three lucky bidders will win a timepiece from the British actress at an upcoming promotional event with Longines.