BOTANY BAY TANKER CO. (AUSTRALIA) PTY. LTD.

The white flag has a yellow ring enclosing a star, red above and blue below, interrupted across the middle by the white field bearing black “BBTC”. The star combines Caltex’s red with Sleigh’s blue. A photograph of John Hunter confirms the funnel but shows a very narrow black top.

Multiple searches found FOTW text authored by Rosanoski, not independent corroboration. Other results concern unrelated modern tankers. Retain the source country without claiming external verification; ownership versus long-term chartering is unverified. The local record coherently describes the Australian Caltex/Sleigh tanker venture and its later names.