Not sure what the basis of this question is. The stock providers for either FN or Browning (some guns were stocked overseas, others stocked in the US) would not have accepted stock blanks that were twisted. If you are referring to stocks with considerable figure and grain, those are French walnut or American Claro walnut, depending on model.
Caramelise.
This type of information is not published. Perhaps it would be best to request that information from Browning directly. As a rule, Browning has never released production figures, but simply the serial number sequences.
YEs
Those imported into the US with the Browning name (since 1956) have had varnished and later polyurethane stocks. Early guns with the FN markings had oil finish stocks.
No
No data available
No
Send it to a Browning authorized repair center.
I would contact Browning directly and see if they have any in stock. I would also look at Boyd's rifle stocks and see if they have any reproductions that would fit your Browning.
Sometimes they will within a particular model.
Browning did not use salt, their supplier did. Check any item made before 1976
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