The date of these slides is unknown. But probably early to mid 1960's, possibly 1963 or 1964. Even though they are Kodachrome slides, there is no date embossed or printed upon them. The 1963 Kodachrome slides for the Brisbane trip do have a date. Perhaps the date machine was broken when they were processed. Anyway, it's likely they were around this time.
Botanical Gardens and Cooks River Boating