One of Adian Olabuenaga’s design a number of four function pens for Acme Studio released in 2006 and no longer available. The four functions, selected by twisting the icon on the barrel, are black ballpoint, 0.7m pencil, orange highlighter and touch screen stylus.
I bought this pen in 2008 and it is unused and complete with metal case, outer card box and instructions.
There is an Acme Studio video on these 4FP (and 7FP) pens on YouTube:

(I will be selling another 4FP pen “Sing Sing” for the same price. Please contact me if you are interested in both pens.)

From the Acme Studio Website:

ADRIAN OLABUENAGA was born in 1955 in Buenos Aires Argentina but grew up and was educated in Los Angeles , California. Raised with an architectural background,he has from a young age, been inspired by architecture, design and art. Primarily working in a medium of functional art, his first solo show was in 1983, featuring his famous art radios and furniture. In 1985, he founded ACME Studios with Lesley Bailey his wife. His jewelry designs were included in the "MEMPHIS Designers for ACME" collection, as suggested by Ettore Sottsass. His necklace "Atomic" from that collection won him an award with DESIGN Plus, Germany. His brooch and earrings from the same collection were featured in the MEMPHIS exhibition in 2005, at Museum of Decorative Arts in Frankfurt, Germany, and most recently these pieces were accepted into the permanent collection of The Metropolitan Museum of Art, NY. Not only is he the CEO, and creative director of ACME but he also currently designs for Ritzenhoff, Boeing, Disney, Mercedes Benz, Warner Bros. and many others, as well as creating corporate identities and branding for many companies. www.AdrianOlabuenaga.com

Price: £39 ….. plus postage
Postage:
UK Tracked 48: £3.45
Europe tracked airmail: £11 (€14)
US & Canada tracked airmail: £15 ($21)
Asia, Australia & New Zealand tracked airmail: £14
Payment: PayPal (G&S or F&F etc) or