Searching for “Altec Semco” I found this other pair of 612 cabs that the seller is claiming are Semco. Even though it looks like one has an Altec badge on the front. Maybe they had a contract to build 612 cabs or something? Who is this Semco?
Altec Lansing 604C drivers in Altec Lansing Semco 612A | Reverb
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