Spot the frisbee

Spot the frisbee I’m waiting to catch, by leaving a letter/number comment and win a special prize. The frisbee has been digitally removed by a hoard of rare golden photoshop monkeys.

NB: Special prize may be one of three dead Bonsai threes. Or a half eaten book on how to keep Bonsai trees alive.

Ok, here the original image.

The answer was D16. Thanks for playing! Alex was the closest with D17. I’ll put you down for an IOU pint.