Bluefield is a type of Gros Michel. Gros Michels used to be the supermarket standard up until the 50's when Panama disease decimated them and made commercial production impractical. Cocos and Highgate are two other types of Gros Michel (all 3 types are said to taste the same).
Gros Michels were replaced by various types of Cavendish bananas (such as Dwarf Cavendish, Grand Nain, Williams, Valery, etc). The Dole & Chiquita bananas you see taking up the most space at stores now are Cavendish types.
Gros Michel bananas are genetically similar to Cavendish (both are AAA), and both make big yellow fruit, but Gros Michel fruits are widely considered to be vastly superior in flavor.
One of our members in San Diego, Jon at Encanto Farms (here's a direct link to
his availability page with contact info), sells Cocos. I've bought one from him, and it was a big healthy plant. If you can get one of those and get it to flourish (which may need some help since it's extremely cold sensitive), the fruit would taste like the Bluefields of your Dad's youth.