It seems that at this time, the insurance was pooled coverage with an outside insurance company. I note that at the time, they didn't have a beef with publishers suing the insurance company (really suing the congregation and having the insurance cover it) for injuries. Note part V "Accidents", section C, on page 35, which says:
" it is not wrong Scripturally either to make a claim on the congregation's insurance or to sue it because of an accident (see Watchtower, November 15, 1973, p. 704, par. 1)"
Also in the same section: " If someone claims injury or damage, do not hesitate to tell him that the con gregation does carry insurance which may apply."
However, now that the society itself administers the insurance, they have changed their tune about publishers suing the congregation for injuries and having the insurance cover it, since it comes right of of Watchtower's pocket now. Note 12/22/97 BOE under "Accidents at Kingdom Halls or Assembly Halls:
"7. If the injured party has personal insurance, encourage him to present his medical expenses to his insurance program. Kindly explain that the Kingdom Hall Assistance Arrangement is based on donated funds and that all expenses incurred are borne by the congregations.
8. Report the accident by phone if there is any threat or mention of legal action. Generally this would only occur if a worldly person happened to injure himself on your property. If this should happen, please obtain his name and address as well as the names and addresses of any witnesses, along with a full description of the incident."