When I got my H1a, there was a 35/2.8 "Accura Wide-Angle" lens screwed to the body in lieu of a body cap. It's a T-mount, preset aperture.
It looks halfway decently made, but there's no black paint on the interior(!), just shiny anodised aluminium. The friend who sold the camera considered it worthless as a lens.

Anyone out there have any experience with these? Looking around the 'net, it seems to have been made by Sigma. I haven't found any firsthand reports of how they are.