This is an original Celestron Ultima eyepiece. It's a five-element 'pseudo-Masuyama' design that offers better correction and more eye relief than a Plossl. AFOV is 52°.
Condition is very good. There is, however, a small triangular black mark at the edge of the field of view. It seems that some part of the baffling or something is intruding slightly into the light path. I only notice it when looking at the moon.
