Rozie: your stamps would seem to fall under this comment in The Serrane Guide to forgeries and the like, published by the APS: "(Montenegro) 1905. An enormous quantity of varieties, wantonly created for the use of collectors."
Someone in the Errors, Freaks, and Oddities Stamp Club might have an interest. Otherwise, I would think these have minimal value. Sorry.
Rosie, you need to use a scanner instead of camera to take pictures, they will be much, much clearer. This is a good website that lists some of the constant varieties in those overprints.
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