I use the following scale state of things:
New - Like new - Mint(+,-) - Excellent(+, - ) - Good working - As is.
A separate listing of technical condition. As a rule, I sell things in working order.
At the lens state. Soviet lenses, even new, ones can have some cosmetic flaws.
I put the original document Krasnogorsk optical plant.
It regulates the amount of defects in NEW LENSES.
As is clear from this document, glass state has never been perfect.
See translate:
NOTICE TO BUYERS!
Lens modern, high-quality lenses manufacturing
from special varieties of optical glass, in
cooking is usually not possible to avoid gas
bubbles. They can always be seen in the complex photo-
graphic lenses. These bubbles do not affect the
the quality of the lens. Furthermore, Soviet GOST standards allow
Availability: opaque inclusions up to 0.5 mm
not more than 6 pcs., some scratches width to 0.02 - 0.03 mm
and no longer than half the diameter of the lens in the light amount
3 pieces, specks of up to 0.3 mm in diameter and the number of not more than
2 pcs., Lint cotton no longer than 3 mm and not more than the number
2 pcs. one lens.
Therefore, the plant does not accept complaints about the bubbles
in lenses and purity acceptable defects or exchange
such lenses.
Quality control department
Krasnogorsk mechanical plant
I usually point out even minor defects.
This may deter a buyer, but I have to say that such defects have absolutely no effect on image quality.
But many Soviet lenses have excellent optical quality, are made of first-class kinds of glass and had a very affordable price.