I would be interested in this lens, complete with trunk case. I am not concerned with the cosmetic condition of it, as long as it's optically and mechanically good. Thankyou very much.
If you can't find the 1200/11 ED IF, your best option would be the 800/5.6 ED IF with a 1.4x converter. The 800/5.6 is a newer design than the 600/4, and the 1.4 x will get you to 1120mm. The 800+1.4x will be better optically than the 600+2x converter.