A jacket specially made for and signed by Arnold Schwarzenegger could fetch £25,000 when it goes up for auction in Hertfordshire later this week.

The jacket, made for The Terminator star during his time as Governor of California, will go up for sale at the Hanson Ross auction in Royston on Friday (September 6).

The unique piece is expected to fetch between £20,000 and £25,000, having been purchased by the seller for £45,000 at a charity auction led by Jay Leno and Arnie himself.

Arnie signature on the jacket.Arnie signature on the jacket. (Image: Hanson Ross)

In a letter to the seller, Arnie thanked them for buying the jacket, saying he was "knocked out" by the result.

"I'm still enjoying the memories of my visit to the Concours d'Elegance in Pebble Beach last month," the letter reads. 

"I was like a kid in a candy store surrounded by all those incredible cars, and I truly could have spent days and days, rather than just a few hours, ogling them all.

The jacket previously sold for £45,000 at a charity auction.The jacket previously sold for £45,000 at a charity auction. (Image: Hanson Ross)

"The icing on the cake, of course, was your enthusiastic performance in the auction for my leather jacket. I was completely knocked out by the result, and I'm very glad that the jacket found such an appreciative new owner.

"Even more importantly, the kids of After-School All-Stars will benefit in a very big way from your generosity. These programs have been a passion of mine for a long time, and I just can't thank you enough for your support.

"Thanks again, and please enjoy the jacket."

The jacket could fetch £25,000 when it goes up for auction on Friday.The jacket could fetch £25,000 when it goes up for auction on Friday. (Image: Hanson Ross)

Arnie's letter to the seller after purchasing the jacket.Arnie's letter to the seller after purchasing the jacket. (Image: Hanson Ross)