The main difference in these Aurora pens is shape and size. The
Aurora 88 pen is the round, cigar-shaped icon, essentially unchanged since 1947 and the larger of the two. The
Aurora Optima is the flat-topped, art-deco sibling: about 15mm shorter capped but the same girth, wearing a signature wide Greek-key center band, and it posts deep enough that people call it "an 88 you can slip in a pocket." Under the hood they're twins, both piston fillers with the same in-house 14K gold nib, and both hide Aurora's clever ink reserve that buys you a page or two past "empty." So it comes down to feel: big hands, or write with the cap posted? Lean 88. Want that same Aurora quality in a more portable body? The Optima's your pen.