Pyrex Pyrex Yellow Floral Casserole Dish with White Interior vintage

This is a vintage Pyrex Butterfly Gold glass refrigerator casserole dish, specifically the 503 model with a 1.5-quart capacity.Pattern & Production HistoryOfficial Name: Butterfly Gold (Version 1).Production Era: This original version featuring the distinct flower and bold butterfly emblem sequence was introduced by Corning in 1972 and manufactured through 1978. A redesigned variant (Butterfly Gold II) with smaller bouquet stems replaced it in 1979.Design Elements: Glossy harvest gold/mustard yellow exterior screen-printed with a retro white floral and wing motif, featuring a milk-white interior.Specifications & UseModel Number: 503 (often stamped on the bottom alongside its 1 ½ QT measurement).