[Klaus]

http://sonyaddict.com/2019/06/01/sony-fe...une-5-6th/

[toni-a]

In fact it was published as a classified ad on yahoo, the seller was asking little money, so it seems more like a stolen or found item.
So most likely it was a real prototype unless it was all set up by Sony which seems unlikely

https://petapixel.com/2019/06/01/it-look...type-lens/

[Klaus]

Those zoom and focus rings do look fake though. As if printed via a 3D printer.

[Rover]

Prolly an early prototype anyway, or even just a physical mockup.

[JJ_SO]

You can buy it, if you like: https://www.dpreview.com/news/3911050659...on-website

[davidmanze]

You can buy it, if you like: https://www.dpreview.com/news/3911050659...on-website

 Looks like this was some birding Sigma engineer who woke up to find just the bayonet on his camera and a large lump on the back of his head .......

[JJ_SO]

No, I think, Sony wants to make a bit extra money for their R&D. Prototypes are not cheap

[Rover]

If it's hollow inside, it could make a good "techno" looking flower vase.

[toni-a]

SONY 200-600 along with Sony 600mmf4 are almost official now, so no it is not fake