Hard to tell without seeing the whole piece, but #276 looks like a
universal lens mount for studio cameras. This was a device to mo9unt
any diameter lens. The iris was closed by turning a small knob on the
side.

On Thu, 17 Feb 2005 09:31:19 GMT, "R.H." wrote:

Just posted some new photos:

http://puzzlephotos.blogspot.com/