I no longer have a Calumet View camera so these 4 Calumet 4 X 4 inch lens boards are for sale.
3 are the standard flat 105822 boards with 42mm, 51mm, and 66mm openings and 1 recessed lens board with a 34mm opening. All are in good shape.
$42.00US for all 4 or $13.00US each plus shipping.