pg_restore: [archiver (db)] Error from TOC entry 2604; 0 55337 TABLE DATA table_1 postgres
pg_restore: [archiver (db)] COPY failed for table "table_1": ERROR:  invalid byte sequence for encoding "UTF8": 0x90
CONTEXT:  COPY table_1, line 21857

pg_dump.exe -E WIN1251 -U postgres -t table_1 -Fp  my_db --file "/tmp/table_1.bak" > "/tmp/table_1.bak.log" 2>&1

pg_dump: SQL command failed
pg_dump: Error message from server: ERROR:  character 0xc496 of encoding "UTF8" has no equivalent in "WIN1251"
pg_dump: The command was: COPY public.table_1(id, name) TO stdout;
/tmp/table_1.bak.log (END)

[root@localhost tmp]# psql -d test_imp -U postgres -f "/tmp/table1_utf8.bak"
SET
SET
SET
SET
SET
SET
SET
SET
SET
CREATE TABLE
ALTER TABLE
psql:/tmp/table1_utf8.bak:39424: ERROR:  invalid byte sequence for encoding "UTF8": 0x90
HINT:  This error can also happen if the byte sequence does not match the encoding expected by the server, which is controlled by "client_encoding".
CONTEXT:  COPY table_1, line 34871