Answer:
The government printed special bills for use by troops in North Africa during WWII. They had different colored seals and bore the date 1934 even though they were made about a decade later. These are the rarest of the $10 series - a bill with a yellow seal but no series letter under the date might sell for $1200.-$5000. at auction in circulated condition. An uncirculated one might go for over $10,000.