Mcm Czech glass Blue, white and clear cased glass vase handblown 6" tall

My research online has led me to believe this piece is Czech glass from the 1960's; however, there are no makers marks. Handblown with pontil scar on underside. Vibrant blue colour with clear glass "windows" and white casing on inside. Beautiful piece that is nice in a display. One of the blue "ribs" on the outside has light scratching (see last photo). Otherwise in excellent condition. This base measures 6" high and approximately 3.5" at widest part. Please note: Photos are considered to form part of the description. Please review all photos.