Shimano Ultegra ST-6770 Prototype Di2 Shifters £65

Shimano Ultegra ST-6770 Prototype Di2 Shifters.

I bought these for a project that'll never happen.
According to the Shimano compatibility chart ST-6770 levers should be compatible as both 10 speed and 11 speed. These are a prototype, but if the buyer has problems with compatibility and I'll give a full refund upon the return of the levers.

£65
Any questions, please feel free to message me.

Not sure what you mean by Prototype? Are they a Pre-released version?

Yes, they have 'prototype' printed on them, rather than a serial number..
Pics to follow.

Now for sale elsewhere.