This filter is new, unused, and now surplus to my needs. Model 752 / 2.1Khz / SSB / Center freq 9001.5 . It can be used in the: Argonaut, Argosy I and II, Paragon, Omni V and Omni VI and Omni VI +; Also the Orion I. $80, includes shipping in US. 73, Don, K8DJ