The Jupiter F-21 is a Soviet-era subminiature camera, commonly known as the "KGB camera" because it was developed for clandestine use by Soviet state security services. It uses a special cassette film format and was built into a small metal body intended to be concealed, for example behind a coat button or inside a bag.

Sales data for the F-21 is extremely thin: the only auction-hammer result on file is a single UK saleroom sale at £700 back in 2007, so a reliable current price band cannot be drawn. As of today, buyers asking what a Jupiter F-21 is worth or how much it sells for in 2026 should treat that figure as a historical reference point rather than a guide to today's value, and confirm market levels against current auction listings before bidding.