The country of origin, the signatures and the serial number would help a lot in identifying your star note.
The practice of producing star replacement notes has ceased in many countries due to the expense of reproducing a selected range of banknotes for the sake of maintaining continuity of the serial number range.
New Zealand has never produced a 50 Shilling coin/note.
current note - 50 CHF
What is the value of a Gutschein 50 pfhennig note
It was the practice of many years ago, that if a note or group of notes were printed with flaws, that the notes would be destroyed and a new note or group of notes would be reprinted with a star on the end of the serial number, hence the term "Star note".
Depends on the date and condition. In general star notes carry a small premium if they're in decent condition. If the series itself is rare (and modern 50s are not) a star note can be worth a lot more than face value."Star" notes are issued to replace notes that were damaged during production. The following is from the Bureau of Engraving and Printing's website:"When an imperfect note is detected during the manufacturing process after the serial number has been overprinted, it must be replaced with a new note. A "star" note is used to replace the imperfect note. Reusing that exact serial number to replace the imperfect note is costly and time consuming. The "star" note has its own special serial number followed by a star in place of a suffix letter. The serial number of the imperfect note that was removed is not used again in the same numbering sequence."
50-500
The silver union star in front of the serial number on new, colour post-2004, $50 bills is a security feature of the note to make counterfeiting more difficult. A small star after the serial number an any denomination indicates that the original note had a printing error and was replaced.
50-350 USD or so
The value of a reprinted 1990 $50 bill can vary depending on its condition and any distinctive features. In most cases, reprinted bills do not hold significant additional value beyond their face value of $50. However, rare or error notes may be worth more to collectors.
If it's been in circulation, it might be worth 50¢ to a dollar extra. However a dealer will probably pay face value. Uncirculated, it might retail for $3.50 to $4.00.
With it being the first series of a full run it is actually quite common. It has no age significance so the value is $50. Do not feel guilty spending it.
The value of a star note is usually somewhat higher than that of a "regular" bill, but the extra value depends very much on the bill's date and condition. If it's a modern (1976 or later) $2 bill, regular-issue ones are only worth face value so a circulated star (replacement) note will only be worth 50¢ to a dollar more. A nice uncirculated one could bring around $4. If the bill is older please post a new question with its date and what letter if any is after the date. You don't need to copy the entire serial number.