I have a Contax 645 Carl Zeiss 350mm/F4 Tele Apo-tessar for sale.
It's rarely used, so it's like new.
Mind you:
1. It's super heavy, bulky, large, and not portable at all.
2. It's AF is slow, don't expect to shoot bird-on-fly with this.
3. In dark, it's not even focus right. Not a problem of this special piece, it's common for this lens.
4. Missing the original lens hood, but I have two third party metal hood for it. (I cascade two when use it).
It turns out to be a much better shade/protection than the original hood.
(but not as portable as the original, but hey, it's bad enough even without it, so, what the hack!).
Otherwise, this is a fantastic lens -- what can I say.
If you are interested, please send in your best offer before next Friday.
The best offer above $3600 get it.
You can find the price from KEH as the reference.