We had a little cubby next to the back door; the milkman put the milk in from the outside, and we unloaded it from the inside. At one point there was a milk cart and horse, I remember from my childhood, the milkman would get off with his wire basket carrier, you could hear him coming by the clink of the milk bottles, and the horse would immediately move on down the street to the next stop. If you were awake early, you'd hear that and the clop, clop of the horse, and the jingle of his harness when he shook his head.
"Gold top" is the one with the cream on top and you can either shake it up or pour the cream off? We kids would get into those and drink the cream straight. It was "standard" (with the cream on top) or "homogenized" (with the cream inseparably mixed in). And here in the US we had little waxed cardboard circles that fit snugly in the top of the bottle, and then a folded circular waxed paper cap over the whole thing.
This would have been suburban Detroit, Michigan in the early 50s.
Blessings,
Barbara