The 2013 Blackmagic Production Camera 4K was the company's first 4K body: a Super 35 global-shutter camera in the original Cinema Camera chassis with a Canon EF mount.
It records UHD ProRes and compressed RAW to internal SSDs, with a 12-stop sensor, fixed touchscreen, and the same minimal control set as the 2.5K Cinema Camera it grew from.
Its global shutter remains the calling card - zero rolling-shutter skew made it a long-lived choice for live music, drones and VFX plates well after newer models arrived.
Used examples are cheap workhorses: check SSD bay wear, the notoriously thirsty internal battery, and screen delamination. Sellers often shorten it to BMPC - don't confuse with the Pocket (BMPCC) line.