It depends a lot on the condition of the PVD coating and whether or not the watch is on its bracelet or a strap.

A green 111.603 made 1600 Euros on a bracelet at the recent Patrizzi auction we have been discussing.

I don't follow these all that closely, but that seems at the strong end for these - I'd normally expect to see them coming in under that. Green and black models seem to make more than the pewter and gold ones too, so that might be the top end for a 112.603, but there are Autavia experts here who will know better than I!