Any good stock maker.
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.
Caramelise.
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.
Between 1966 and 1972, the Morton Salt Company sold Browning a new salt method of "speed drying" walnut blanks when Browning's ability to provide kiln-dried wood couldn't keep up with demand. There was a down side to this process. It yielded a good many salt-filled stocks and/or forearms that resulted in rusting metal surfaces where there was wood/metal contact.
1923 - 1966 had round knobs as standard stocks 1967 and up had flat pistol grips auto5man my browning a-5 made in 1988 in liege belgium has the roung knob stock, and i know it has never been changed. I ask the question " did browning offer both round knobs and pistol grips from 1067 on?"
Sometimes they will within a particular model.
Browning did not use salt, their supplier did. Check any item made before 1976