The Baby 4x4 Rolleiflex Model K5 Black is a twin-lens reflex camera made by Rollei for the 127 roll film format, producing 4x4cm square negatives. The black-finish K5 variant was introduced in the late 1950s and sat below the 6x6 Rolleiflex line as a more compact alternative aimed at amateur users.

At recent UK auction, hammer prices for the Baby 4x4 Rolleiflex K5 in black have sat between roughly £120 and £280, with the two recorded sales averaging around £200. As of today in 2026 the market is thin and condition-sensitive, so what a given example sells for at saleroom level depends heavily on cosmetics and shutter function — figures above reflect wholesale hammer results and exclude buyer's premium.