What is the value of a 500 mark Reichsbanknote date April 1 1923?

Could you check the date again? By April 1923 hyperinflation had reached such a point that 500 Reichsmarks was effectively worthless, and most bills were in much larger denominations.

In any case Weimar-era hyperinflation currency was printed in such enormous quantities that it has little value to collectors. www.sammler.com, a major German collectibles site, lists the majority bills at under $15, and many of those less than $5.