Продам: Antique miniature

[Борис Кон]

Antique miniature - ink, pen , watercolor.
There is a signature of the author ( neizvetnogo me - who can be able to determine )
In the lower left -hand corner is the date : 1501
The photo shows the old frame of the early 20th century.
Then I designed - in a wooden vintage prints bought in Spain.
Paper without watermark , the flip side is almost dark.
Size: 23 x 17 cm
Help determine the cost , and buy for Christ.