Help, please, to determine whether the valuable painting

[milena525]

Hello experts, please help determine whether the painting is valuable and to evaluate its cost. The painting was brought from America, age is not known, but the view is very old. The painting is signed by H. Jasperb, even on the back is starone stamp Mexiko (last 2 letters of badly visible).
Please take a look at the photo.
picture painted in oil.
size of the picture 27 to 31.
Thank you in advance.