Set of 5 x 50mm SBIG round, unmounted filters: Luminance, Red, Green, Blue and Clear.
Purchased with QHY9 camera on IIS in 2009. I presume these to be the same as shown here:
https://www.astronomics.com/research...l-filters.html
They are in excellent condition as have been in storage most of that period, while I was using other filters.
$450 plus postage.
Phil