Omega part no 550-1200 including 550-1208 (the mainspring). Fits Omega caliber series 550, 551, 552, 561, 562, 563, 564, 565, 751, 752 Used mainspring, barrel and core. Cleaned, controlled and lubricated with braking grease Moebius 8217 and HP1300 at core and spring. Ready to install. Spring is used but in decent to good condition, fully functiong with no deformation. Barrel teeth, depth and general check conducted. Pictures are example pictures and not pictures of the actual product. The actual product is however in equivalent condition.
