Butterfly, Northwood
Northwood's bonbon has a single butterfly with stippled rays radiating from the center. Most of these have a plain back, but a few have fine rings circling the back as shown on the right and are referred to as "threaded."

Hartung Book Two Butterfly, Northwood

Bonbons, plain back or not specified

Amethyst/purple, 15, 20, 25, 35, 45 (all 2019), 15, 20 (both 2020), 20, 30, 60 (all 2021)

Amethyst/purple, electric, 1,700 (2008)

Green, 15, 40 (both 2019), 20, 25, 30 (all 2020), 30 (2021)

Marigold, 10, 15 (both 2019), 15, 20 (both 2021)

Violet, 60 (2013)

Smoke, 175, 450 (both 1998), 350 (2012), 275 (2018)

Bonbon, threaded back

Amethyst/purple, 80, 85 (both 2018), 110 (2019), 55 (2020)

Blue, 130, 140 (both 2018), 275, 500 (both 2019), 190, 475 (both 2020)

Blue, electric, 500 (2011)

Green, 150, 170 (both 2016), 150 (2019), 160 (2020), 65 (2021)

Green, emerald, 1,100 (2000)

Ice blue, 450, 1,300 (both 2017), 600 (2019), 800 (2021)

Marigold, 350 (2012), 180 (2013), 200 (2015), 110 (2021)

Updated 7/8/2021