My grandmother's maiden name was SCHERL - PERLMUTTER.
Family legend is that the reason for the double name is  that one of her PERLMUTTER ancestors
was a salt merchant, exporting salt to Russia. In one incident he got into trouble while crossing the border back from Russia.  
Following his Rabbi's advice, he escaped with his family "southwards" to East Galicia, possibly to  Kossow.
He also changed his formal name from PERLMUTTER to SCHERL (possibly by "buying" the identity of a deceased  Jew).

I estimate the time of the incident in about mid 1800s, after formal  surnames were adopted.

We have no idea where our PERLMUTTER  came from and therefore no idea at all about this PERLMUTTER branch.

My question is: Where could have been  a possible place that a Jew earned his living from exporting salt to Russia in mid 1800s,
located probably anywhere  "north"  to Galicia?

--
Yohanan LOEFFLER
Melbourne, Australia

Researching (main surnames):
From Austria, Slovakia: LOFFLER / LEFLER, LEDERER, SCHNEIDER, NATHAN, SEELENFRIED, ZAPPERT.
From Bukowina, Galicia: MINSTER / MUNSTER, NAGEL, SCHERL, PERLMUTTER, IWANIR.
From Poland / Belarus: ALTMAN, KAMINSKY, KAMINKIER, LUBETKIN, SZTARK, YOSELEWICZ, KOSLOWSKI, KRAMARZ, RAUCHFELD.