Peace, mercy, and blessings of God be upon you. Due to the nature of my work, I handle large quantities of Saudi banknotes daily. If you are looking for a distinct serial number (solid number, radar, ladder) or a specific birthdate or a certain anniversary on denominations (5, 10, 50, 100, 500 Riyals), I would be happy to help you find it. All you have to do is send the number or date you are looking for via private message, and if it is available, I will contact you directly. I am honored to serve you and fulfill your special requests. Thank you.