Dating rolleiflex serial number
Built-in, uncoupled meter, Automatic DOF Indicator.
Optional uncoupled meter, detachable hood, improved focus screen.
Distance scale in meters AND feet after Serial # 2298816.
Serial #'s after 2299547 accept both 120 and 220 film. Rollei expert Alex Pearlman remarks that the Tessar on the Rolleiflex T utilizes Lanthanum glass for improved resolution and color correction. Optional coupled meter, has detachable hood, improved focus screen, eye level viewing, distance scale in meters or feet. You may find a great guide on Rollei serial numbers at the Peter Rongsted Rollei page.A Rollei company timeline can be found at Retrography.com; another source of extensive information is Rollei Club.
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Coupled Meter was optional, but most were installed.