A related blue-field version has the white-outlined chevron and white CALSO letters, again with taller L. The Calso brand was used from 1946 to 1958 before replacement by Chevron.
Rosanoski considers the lettering more likely to indicate the managers. Stewart makes the funnel letters equal in height, which he doubts.
California Transport became Chevron Transport in 1965. It was operated by California Shipping, subsequently Chevron Shipping.
USA, Perth Amboy, New Jersey.
Keep the explicit scope label independent; no alias or company identity is inferred.