Help to determine the age and to evaluate the icon

[chiflado]

Thank you very much for the detailed answers.
Let's have another question: how likely given above to estimate the time - boundary of 19-20 centuries and what is it based?
The question arose in connection with the fact that this is somewhat at odds with the legend. My calculations based on legends. Great-grandmother was born in 1857 and died in 1958 at the age of 101 years. She gave an icon of her grandfather, the lifetime of which is not known. But if we assume statistically, that he was 50 years older granddaughter and lived to 70 years, it turns out that he gave her the icon still 1877. And who knows how many years before his death he had acquired.