These glass vinaigrette servers [#FT146] were designed by Frank Thrower in 1970 and produced in 1971. They are handmade- as happened in the 70s- and they’re avocado-shaped, and come in their original [quite funky] box.
Frank Thrower designed a number of condiment servers based around the avocado- you might have seen his avocado serving bowls. The vinaigrette servers were made to accompany them. Frank is so famous he has a blog dedicated to him: frankthrower.blogspot.com. I seen these servers [used, without the box] for sale on Ebay for $35.
The Dressing Servers are as new- never been out of the box, and are for sale: $AUD25. Perfect for the retro- 70s- table setting.