1972 - Probe - Facts About Life and Life Insurance, New York: Probe, Englesman and Josephson
1973 0115 - Probe - The CLU Pledge and Cost Standings --- p1757
2018 1118 - No. 294: Universal Life Policies—a Disaster for Life Insurance Companies and Their Policyholders, by Joseph Belth - [link]
In the January 1, 1976 issue of Probe, the late Halsey Josephson's sprightly newsletter, he said a company had just announced the use of an investment-year method, but he did not identify the company.
In response to my inquiry, he said it was The Equitable Life Assurance Society of the United States.