sql - Oracle timestamp with timezone in where clause issue

Question

I have the following sql query with

select * from MY_TABLE
 MY_COL >= to_timestamp_tz('08-03-17 07:25:00.0000 EST', 'dd-mm-yy hh24:mi:ss.ff TZR') and 
 MY_COL <= to_timestamp_tz('08-03-17 09:08:00.0000 EST', 'dd-mm-yy hh24:mi:ss.ff TZR')

Where there are atleast the following 2 entries(as displayed in sql developer).

03-AUG-17 07.25.51.576000000 AM AMERICA/NEW_YORK
03-AUG-17 07.31.33.553000000 AM AMERICA/NEW_YORK

My query returns no entries. I would expect to get both these entries back. Is there something obvious that I am missing here?

thanks