Profile just released a quick promo for the Push Stem, and summed it up very well:

"2019 marks a decade of the Mark Mulville Push Stem.
To Celebrate, Profile helped Mark get back to Pittsburgh (the city that inspired the stem) to film with Bobby Valentine upon the release of the first of several VERY limited Push stems throughout the year. First up, the Push "Pirate" colorway.
22 (11 x 48mm/11 x 53mm) available as of today (June 5th, 2019.).
Contact your local bike shop to grab one.
Thanks to Mark for decades of support."