Vintage Avon Milkglass Lidded Jar

Vintage Avon Milkglass Lidded Jar I've seen this on other sites, yet none have noticed or brought to attention the unique feature of the lids knob fitting into the bottom. Isn't that a neat feature and worthy of mention? Very good used condition with some wear on gold scroll band, and one small chip on inner rim of container. Great for cotton balls, etc.