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Kiron 70-210 mm f/ 4 MC Macro is the early version that was fitted with Zoomlock only. It was in production from 1982. It was replaced by a similar lens that also had a Focustop facility.
It can be identified by having a serial number as follows: 259xxxxx
The later lens has a serial number in the sequence:
1983 - 367xxxxx
1984 - 467xxxxx