Could somebody please help me identify this board?

[Eric Smith]

On Wed, Dec 7, 2016 at 9:28 PM, Eric Smith <spacewar at gmail.com> wrote:

> Given that it's extended length anyhow, and thus not compliant with the
> bus spec, it doesn't really matter which side of the board the components
> are on, other than it precludes use in some backplane slots. I may have
> been designed that way to fit in a specific slot in a specific machine.
>

On the other hand, the pin count on the wider edge connector is 100 rather
than 86 so not Multibus.