Client Tools :: Unable To Insert Euro Symbol In Database With Character Set WE8MSWIN1252?

I am using oracle 9.2.0.6.0 on HP-UX.

I am unable to insert and even display euro symbol from server as well as windows client.

Following are the details of my database server

SQL> select * from nls_database_parameters;
PARAMETER VALUE
------------------------------ ----------------------------------------
NLS_LANGUAGE AMERICAN
NLS_TERRITORY AMERICA
NLS_CURRENCY $
NLS_ISO_CURRENCY AMERICA
NLS_NUMERIC_CHARACTERS .,
NLS_CHARACTERSET WE8MSWIN1252

[code]....

1) When I try to insert € from Db server (using putty) using Alt+0128 it does not print anything (nothing gets typed on the screen). Not even junk characters Also following query does not print anything

SQL> select chr(128) from dual;
C
-

2) while I set NLS_LANG on client and try to insert €, Alt+0128 produces a question mark symbol And following query displays junk character

SQL> select chr(128) from dual;

C
-
Ç

3) Regardless when I inserted couple of rows and tried UNISTR following was the result

SQL> select unistr(v) from t;
Error 45 initializing SQL*Plus
Internal error
$