In 1976 the duo had set up the company and put together their Apple I in the garage of the house belonging to Jobs' parents in Palo Alto in California.
This was the basis for the first personal computer; the buyer still had to add a keyboard, a video display and a cassette recorder for use as a storage medium.
About 200 Apple I computers were manufactured and sold for $666.66.
Of these, 43 are thought to survive, so the discovery of a working model caused a major stir in computer circles.
Breker beat the drum in the run-up to the auction on November 24, even advertising the sale on the electronic screen in New York's Times Square.
With an estimate of €120,000-150,000, there was plenty of scope for bidders. After all, in July 2012 Sotheby's in New York sold another working Apple I for $310,000 (then £198,960).
On auction day the bidding went way past this mark and reached €400,000 (£325,205) before the anonymous buyer, appropriately enough bidding online, could settle the matter. With premium, that is almost €500,000 - or about $630,000.
The buyer's premium was 22.97%
