This lens was made to 1/12 wave Peak to Valley by a professional optician for his own use. It is mounted in a finely machined cell, in a 5" diameter white recently-painted tube, blackened, baffled interior, with a decent 2" focuser.
This planetary quality lens is far superior to the far-eastern optics that have lowered the perceived value of fine achromats. The only cosmetic defects are some paint blemishes where the focuser was interchanged, touch-up-able. The focuser has sufficient in-focus for a Chromacor, although the color error at F15 is unobtrusive.
Intriguing trades considered.