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Certina 'Biostar Electronic', Grenchen, No. 8644505, Ref. 7506.001. Produced in the 1970's. Unusual
Biostar Electronic, No. 8644505, 13J, stainless
Certina, Ref. 5826. Cased by Elgin Illinois, produced in a very few examples at the end of the
*, 21J, stainless
Certina 'Biostar Electronic', Grenchen,No. 8644505, Ref. 7506.001. Produced in the 1970's. Unusual
Biostar Electronic, 13J, stainless