I have a Zeiss Ikon Maximar 207/3 which is 6.5x9.
It came with a film pack adapter # 668/2 but I am not sure if it will fit a Recomar.
The holder has grooves down the side so the lip is skinny as is the slide part on the camera back.

I am not sure if the entire side flange including groove is considered fat lip though.

After someone on this forum suggested using it to make a GG back I am planning on doing so once I find me a pices of ground glass for it.
In the meantime I cut a piece of Wax Paper and taped it inside the holder to use as a viewing screen; not perfect but it works quite well.