Steve Jobs' Apple 1 computer prototype is up for sale by RR Auction. The auction house estimates the historic prototype has a $500,000 value and as of July 25, the leading bid is $278,005.

The auction house has projected the functioning Apple-1 computer could end up getting bought for over $200,000. Bidding for it had already reached over $111,000 as of Tuesday afternoon.

The employee brought the computer to McIntosh at the Indianapolis Data Domain. But that store soon closed as well, and management told McIntosh he could keep the Apple, he said.

Then, last year, the company rolled out that feature to US Apple Store locations. According to Bloomberg, here's how it works: "The system looks a bit like a metal cubby for shoes.

The machine was signed by Apple co-founder Steve Wozniak and it is in full operational condition. There were around 200 Apple-1 computers produced in 1976, and 175 of those were sold.