Sirius Optics MV-1 1 1/4" minus violet filter in like new condition.
Multilayer coatings effectively reduce or eliminate the violet chromatic aberrations of achromatic refractors. Definitely makes an improvement, check the review sites for the positive reviews. Perfect for non-APO scopes.
With spectral plot and original case, like new.
$65 shipped CONUS
Since this should fit in a Priority envelope, even Europe or Australia will be okay with added shipping and if payment can be worked out, but email for actual shipping costs.