In the stamp collecting world, it's the equivalent of a mystery treasure find.

An Australian auction house is predicting a recently discovered Australian Kangaroo stamp could attract global bidders and fetch as much as $25,000 when it goes under the hammer.

The 1913 ten shilling stamp was deemed so valuable was because of a printing error which left it with a doubling of the frame, auctioneer Charles Leski said.

The previously unrecorded stamp might have struggled to sell for $1,000 but because of the "philatelic faux pas", interest would be high, he said.

"Australian Kangaroo stamps are collected all over the world," Mr Leski said.

"This stamp is not recorded in any of the philatelic literature, so for serious collectors it is like stumbling across a hitherto unknown find.

"Interest will be high and the bidding is likely to be intense."