1970s 1975 (?) Σ Sigma Instrument Catalog

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I once owned a DT22

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And a DR9 with the snowflake fretmarkers.

Someone before me buffed off the Sigma lettering that was apparently painted over the finish.

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And as far as dating these goes, it is hard.

All of the serial numbers that I could make out in the catalog photos start with 1 and end in 2. The second digits are 5, 6,7, & 8. The serial numbers are 5 digits.

1536x
16542
1798x
18162

With the truss rod covers. I would assume they were made before 1976.

Heck of a coincidence that the last digits are 2. Same with my DT22. Wish I could see more of the serial numbers.

Could these be from 1971 for a 1972 catalog, or more likely 1972 for a 1973 catalog?
 
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