Here are my Onoto pens, sitting on their 12-pen case in which they do not all fit. The photos group the pens by nib.
Four with No.2 nib. From the bottom up, two 3050, a 5601 (nib exposed) and 4601.
No.3 nib, a 2000 and 3000.
3/ST nib, being a 3000 (top) and 5601. The 6233 missed the shoot.
Two 6234 with No.5 nib, and an interloper, a "modern" (1960) lever fill 21 with No.15 nib.
The Swift (?) lever fill with No 17 nib.
Finally, a 1220 and 1332 with No.22 nib, both lever fill.
When you receive new information you can change your mind, or you can close it; or you can try shooting the messenger.