Having sold my CCD camera I have no need for this filter. It had been on order and was delivered right after I sold the camera. It is a 656.3 nm filter with a 4.5 nm bandpass. It has never been out of it's paper pouch. It is 1.25" and will screw into a color filter wheel. I opted to get it with anti-reflective coatings since I have seen a lot of people on SBIG's Yahoo group talking about reflections in their image train and I wanted to remove this filter as a possible cause.
I bought it new from Custom Scientific in January,2004 for $225 for the filter with an additional $50 for the anti-reflective coating. The shipping and handling was $16 for a total of $291.
It still has it's full warranty from Custon Scientific.
I am asking $250 delivered CONUS.
Cashiers check, money order or PayPal.