Oh, dude, a "pygaen" is like a mythical creature you won't find in any encyclopedia. It's probably chilling with Bigfoot and the Loch Ness Monster, having a grand old time. So, if you're looking to spot a pygaen, you might need a unicorn detector too.
The 1917 banknote featuring "Pygaen" is the Russian 25-ruble note. The term "Pygaen" refers to the depiction of a peasant holding a sickle and a hammer, symbolizing the Bolshevik Revolution and the working class. This banknote is significant as it reflects the political and social changes occurring in Russia during that tumultuous period.
The value of 100 CTO PYGAEN 1997 in the US depends on its context, such as whether it refers to a currency or a collectible item. If it refers to a currency, you would need to check the current exchange rate for the specific currency to convert it into US dollars. If it’s a collectible, its value would depend on its condition, rarity, and market demand. For precise valuation, more specific details are needed.