Between my husband and I, we have acquired enough Retro 51 pens to require an actual display case for our collection. Luckily, there is a lovely Bamboo Pen Tray ($60) available made especially to hold sixteen of your favorite Retro 51 pens.
The plexiglass cover is magnetic so its easy to lift off to remove your pens and pens are held in place with black elastics on a black velvet background.
The box is wide enough that it can be set on its end so it can be a “picture” so to speak rather than to occupy a flat space on your desk too.
The collection in our box is about half mine, half Bob. Can you guess which pens belong to each of us?