F.P.Riznichenko, please help with the assessment

[Tess-Alex]

Good day,
Got such a sketch from her grandmother.
Size: 14 * 19
oil
At the technical picture shows a slice. It seems , cardboard or something
Legible signature ( Riznichenko ), year, it seems , 1909
There is a potential buyer , but he wants to call the price we. Naturally, with such amount to anything significant are none , but absolutely for nothing too do not want to give away , and it makes no sense ...
Tell me, please , how you can request not to zatryahivatsya ?

Thanks in advance!