Vintage 1960s Chrome rOtring "Quattro" Multi-Ballpoint Pen Four Colors Rare

Description

Offered here is a rare circa 1960s rOtring "quatro" multi-pen in the familiar rOtring faceted sides on a chromed steel barrel and red ring on the top.  The pen utilizes small sliders to propel the selected color or to retract it.  It is 123.2 mm long and 9.5 mm in diameter. While the propelling and retracting mechanism has been tested and works, there are two missing cartridges and the others have dried up.  Also, there are small, recessed rectangles which would have a color to indicate to the user what color the cartridge is.  These are now devoid of color as far as I can tell, and would need a touch or paint, or perhaps colored adhesive paper inserts.  Cosmetically, the pen is in nice, vintage condition with no dents or significant scratches.  Please view all of the photos for better details, as they are considered an important part of the description. Feel free to ask any questions you have or request more photos.  These older rOtring multi-pens are a bit of a rarity, especially in the United States.
Regarding shipping: I utilize United States Postal Service Ground Advantage for almost all sales, purchased through eBay shipping. I will combine purchases whenever possible to save shipping costs upon request. I only ship domestically. International buyers from select countries are welcome ONLY through eBay's International Shipping Program.
Thanks for looking!