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Alex you wrote:

"25      38    51    65    68    71     82    90    127
-0.5   -0.4  -0.4  -0.6  -0.2  -0.1   -0.2  -0.2  -0.8

Should I attach this table to my sextant box lid as a
certificate, and use it?"

 

I would. How do you feel about the large jumps in the table from 65 to 68 and, less so, from 90 to 127?

 

Incidentally, you wrote:

"But even the seller
confirmed that in the last years of Soviet Union, no one
really cared to measure and they filled the certificates with
random numbers (even did not care to vary these numbers:-)"

 

I think this is likely to be the case with a lot of modern sextants for all the usual reasons: declining use of celestial, inherent limitations to most celestial at the one arc minute level, etc.

 

I see no particular problem with using an eccentricity table or arc error table if it's been validated carefully. I think this is probably the best practical reason for shooting lunars (which seem to be somewhat superior to star-star sights when they're done right).