Wood Lens Board for Burke & James 5x7 Wooden View Camera, #3 (68mm) Hole

Description

Wood lens board, just over 5 inches square, and painted black (original) . #3 Hole, which measures just about 68mm. It has some hairline cracks but they don't compromise the board. It's solid. There's some sort of what I guess is wood glue on the back and front Apart from the glue the front is flat and the back has a lip all the way around. Width of the cutaway area of the lip is 5mm, and the height of the cutaway is about 2.5mm. The elevated square on the back measures about 82mm. No bevel on any edge.
Fits
the 5x7 models of the old B&J wooden field camera. I do not know if it fits the 4x5 and 8x10 versions. As the photo shows, it is 5 and 1/8" square. So, measure. 5 1/8 inch square, with cutaway area on the rear cut in 5mm, and the height of the cutaway about 2.5mm. The elevated square on the back measures about 82mm. No bevel on any edge.
The hole can of course be "reduced" to a smaller hole of any size desired.
Just use a smaller wood, plastic, or metal "washer" with an opening of the desired diameter over the hole. I have done that with plastic in the past...