Unbranded unknown grips

[diecidecimi]

I thought to be a grip-expert, after reading threads and visiting websites since some years. I purchased in Your Country several vintage grips never seen here in Europe, factory and custom, Herrett's, Fitz, SILE, and so on (however nor Ropers neither Sandersons, Cloyce or Fuzzy Farrant, too expensive for our standard). So? One of my last set I bought is a N frame , smooth target style I can not identify. Upper right portion is Fitz-like shaped, as inferior palmrest, but analogies terminate here. Finger grooved, thumbrest (yes, this is what I usually want), beefy.
No marks , except an S carved in the interior of the right panel, no writings. Can someone help me in identifying it? Thanks
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[H Richard]

They sort of resemble Sandersons, but are possibly "one of" by a hobbyist with some talent.

[Druggist50]

Are they possibly some Keith Brown ropers?

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[diecidecimi]

No, of course they are not so precious as that. Sandersons were checkered, darker, inside numbered. Keith Brown are very refined and glossy.