This is an old Mayflower 3" f/15 lens from Japan, probably 60's
vintage. Comes in a heavy duty adjustable aluminum cell with thread
on aluminum dew shield. All painted black. The coatings on the lens
have deteriorated, and there are 2 very small edge chips. Lens still
produces a decent image. Also can throw in a pvc adapter that will allow
this to be mounted to any 3" tube with screws.
$40 shipped in the CONUS