ERROR: invalid byte sequence for encoding "UTF8": 0xfc

Folks


From another system (non postgres) as data gets changed we collect in the form like below into a named pipe which is
tailedinto psql -U csidba -d repdb -hrephost 

insert into foo (mydata) values ('{"mail_stop": "" , "city_id": "Garching bei M?nchen"}');

And got a failure
ERROR:  invalid byte sequence for encoding "UTF8": 0xfc


insert into foo (mydata) values ('{"mail_stop": "" , "city_id": "Garching bei M?nchen"}');

Problem is said system to convert to UTF8 is nicely put a huge amount of effort and we don't have the resources anyway
atthis point 


This is not a copy, just a tailed named pipe into psql

Is there any trick/way I can shove this data into Postgres ? I really don't care whether it read "Garching bei M?nchen"
or"Garching bei Mfoonchen" 



Thanks
— Armand