Four old paintings
 

Hello
At the forum the first time. Please help in assessing the value of old paintings. Artworks inherited this part of the collection, which was collected in 20-30th years of distant relatives in bourgeois Latvia. The examination of paintings not done, what is the cost of these pictures without examination?
Picture number 1 - Unsigned, oil on cardboard, size 41h33, creation time (presumably the end of 1919 beginning of 20 century), the state - on the right side with not much worn.

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Picture number 2 - Pavel Sokolov, 1881, the signature is available, teh.izgotovleniya: Cardboard, on a cardboard sheet with a paper drawing (pastel, pencil? Difficult to say).
Never faced with such risunkom.Razmer 38h30, good condition, photos are attached.

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Picture number 3 A.Rylov, presumably beginning of 20 century, teh.izgotovleniya: cardboard on it a piece of paper (watercolor), the size 35h27, the signature is available, good condition, photos are attached.

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Picture number 4 S.Kuvshinnikova (I assume), in 1889, teh.izgotovleniya: watercolor, size 22h15, the signature is, good condition, photos are attached.

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I would be grateful for any help.

For the first proposal, $ 1000