Source: https://archive.org/details/1950-advertisement-for-keefer-goldtone-pencils From the 4 November 1950 edition of Australian Women's Weekly.
It is quite a surprise for me to see mechanical pencil is marketed as luxury product.
If only girl gift me a mechanical pencil on my date :D we'll see, we can write letter to each other, instead of texting.
Apparently still around, just not making mechanical pencils:
http://www.keeferbros.com.au/about-us.asp
"Trevor's son, Geoff remembers starting to help his dad make the first gas taps in about 1961. During this period the company also manufactured the well-known Keefer propelling pencils."