The SLC was built in far smaller numbers than the R107 SL over its roughly nine-year run, with commenters citing figures such as ~31,000 SLCs vs 237,000+ SLs, and around 63,000 total across all SLC variants. Detailed per-year numbers are quoted for the 280SLC (1,741 in 1979) and 380SLC (3,789 total), reinforcing the 'four times rarer than the SL' framing.
Rarity and production numbers relative to the SL
Mercedes-Benz SLC (C107) · history