Mark's Sigma 28-70mm F3.5 lensFD mount. Came with a Canon T70 camera. 5-4-23: Came with Canon T70. Barrel was covered with sticky black goo. Removed it with alcohol. Focus and zoom lettering was stamped on top of it, also removed. Seems to work fine. Wonder if heat degraded it, or some solvent. Maybe it just rots with age.
<! <! <! <! <! <! <! <!