A cobalt blue glass Milk of Magnesia bottle, bearing the words "MILK OF MAGNESIA" and 'REGISTERED TRADE MARK'. The raised letters and numerals on the base read '4A 14'.
I can remember this type and shape of bottle from my childhood (far too long ago!) but the raised lettering would indicate that is older than the ones I recall.
A fraction under 5 inches in height and in excellent condition. Please take a look at all the full-sized photos.