Thank you ladies and gentleman for the idea. I received my Graf von Faber Castell yesterday and am quite happy with both the size and the ease of use. I've been searching for tiny pens / mechanical pencils for my Grand Modele and Ulysse for a long time. For a while I've been using the H silver Naulitus (not sure if it's the right name) for my GM but it's not ideal, it always gets me pulled aside whenever I go through airport security.
Muji is good but it's not the most comfortable to hold in hand, as it is soooo thin. I got both pen and pencil from Graf von Faber Castell. They're too thick for GM but perfect for Ulysse. They stick out a bit but within an acceptable extent. And they have enough weight and length to allow you to write comfortably. I have quite a few Ulysses but don't use them when I'm on the go due to the pencil issue. Now I can finally put them in good use!
And all these 3 can easily fit into a bastia or a calvi! I might have to follow Etoile to bring post-it with a bastia. What a great idea!
Here are a few comparison photos of the pens / pencils
H / Graf von Faber-Castell / Muji
They're more or less the same length when closed
View attachment 3777130
H / Graf von Faber-Castell / Muji
Once opened, Graf von Faber-Castell is significantly longer and very easy to use
View attachment 3777139
GvFC vs. Muji inside a Ulysse
View attachment 3777140
Comparison between GvFC and Muji when Ulysse is closed
View attachment 3777143
Muji inside a Grand Modele
View attachment 3777141
H inside a GM
View attachment 3777142
GvFC doesn't fit into those loops
How it looks with Muji when GM is closed
View attachment 3777145
Last but not least, to stay on topic, these are part of my rainbow inside my h bag. Now that I see I probably need some purple and green
View attachment 3777146