A two-sided metal acetate test copy of Led Zeppelin's 'Your Time Is Gonna Come' has fetched $3,600 on eBay after 40 bids.

Featuring the memorably blues-soaked track from the band's self-titled 1969 debut album, the item formerly belonged to a disc jockey who worked in the U.K. and South Africa, according to its Austin-based seller.

'Your Time Is Gonna Come' is, itself, sort of a rarity. The song is said to have been performed only once onstage by Zeppelin, as part of a medley with 'Whole Lotta Love' during a 1971 concert in Tokyo. Jimmy Page played steel guitar on the original sessions, while co-writer John Paul Jones -- in another unusual circumstance -- switched to organ. Page later delved back into 'Your Time Is Gonna Come' during a series of concert appearances with the Black Crowes, later documented on the album 'Live at the Greek.'

'Your Time is Gonna Come' was recently named by Ultimate Classic Rock as one of Led Zeppelin's Top 10 Heartbreak Songs. Side two of the recently sold seven-inch, 45-rpm acetate includes an instrumental cut.