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
See the original document in the description photo.
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.