I wanted to point out an interesting pattern I've seen a few times over the years. There is this diamond/checkerboard pattern inlaid stocks of which I'm unsure of the origin. They look similar to the Dzeferdars of Bosnia & Montenegro but I have only seen them with bone/ivory and not mother of pearl.
Here is an example that sold at auction in the last couple years in Germany.
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This is on display in the Hisart museum in Istanbul
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And this was sold back in 2012 in the USA. It has a typical "Gaborovo" lock from Bulgaria, perhaps a hint at it's origins?
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I guess I have seen maybe one or two examples over the years
edit: The more I look at it now, I believe this last example is the one that is on display in the Hisart museum!