50-100
3. I know Hans has been an avid collector of early Zeiss serial numbers for some time, so he may already have the answer to your question. My early serial numbers are: 8x20 Feldstecher: flat top, no ipd scale, signed in script, S/N 1634; 12x25 Feldstecher: sloping top, ipd scale, signed in script, S/N 9481; ................
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