That depends on what was bid as a maximum. You often see it in CNG's online auction for example, where similarly odd numbers (e.g.501) appear as the hammer price. It happens more often in the US than the UK, but a maximum bid is a maximum bid, even if the increments are required in standard steps. Online bidding might not allow it due to a drop down menu of increments, but a postal or email bid can have any number. And the auction house makes a small amount of additional income, so wouldn't turn it down.