Nataniel Ziehel, help assess the pattern

[sergejnowo]

Stuart, the correct name is written as an artist : Nathaniel SICHEL (1843-1907).
Indeed much like a reproduction, though not a fact.
Take a decent photograph , say the lips or eyes in the portrait of him can be accurately say a painting or a reproduction.
If this painting:
Formal examination is not necessary, it is not accepted at this level , and , and so everything is clear.
Should I invest in the restoration ?
No, of course , can be cleaned and not fact.
Must sell in Germany. At the auction will take with the launch of 500 - 1000 euro , and then as God wills .