>While an official Cross–White House program was begun under president Bill Clinton, it is known that the tradition goes back to at least the administration of Gerald Ford.[7] All presidents from Ronald Reagan to Donald Trump[7][1] signed legislation using Cross pens; it is unknown if earlier presidents did so.[1] Obama, George W. Bush and Clinton favored the Cross Townsend model; Obama later switched to the Century II model in black lacquer, with black medium point refill.[7] The Trump administration placed an initial order for 150 Cross Century II pens in January 2017.[7]
https:// en.wikipedia. org/wiki/A._T._Cross_Company
These are really expensive pens.