What does O.P.S Mean on side of my U.O ortho

Title says it all. It has "O.P.S" stamped on the sloped side of the black top. It was obviously done at the time of manufacture. Not sure what it means.

Can anybody help?

Jeff

Hi Jeff,

O.P.S. = Orthoscopic Planetary Series. These were a series of orthos that supposedly had special coatings for enhancing planetary viewing. IIRC, they were only sold for a short period.