What do you mean by "fat, front-heavy pens"? I'm genuinely curious. The article doesn't have a ton of close-up photos and none of them would seem to match that description.

The pens they do show have a profile that reminds me a bit of the Montegrappa Elmo, which I have and love:

https://www.montegrappa.com/en/cluster/fattoperte/myfirstmon...