Indeed. And I just accidentally bought a 224, on its way from Seattle to Victoria (about 120km, or three weeks at current postal speeds). It looks like at has a number 5 nib in it, so that's interesting!
Apologies for the typo, it's a 294 not a 994. Glorious pen. I'll take some photos soon . . .
Congratulations, what a nice accident! You seem to have some great sources of Osmia pens that you hardly find this side of the big pond.
It seems that nib sizes and model numbers are a bit of a mystery (aka chaos) with Osmia. In many cases I see a clear pattern (s. above) but then you find outliers. Today, finally I found a box of pens that went astray during my last move quite a while ago. I was so happy and looked closely at every of the resurfaced pens. Among them an Osmia 64 with an original 14k #6 nib. If it was a pre-war pen, the 14k nib would be in agreement (post-war 64 had steel nibs and 664 14k gold nibs). Lambrou mentions a series (62, 64, 66) of 1930s Supra pens and this could be one of them. But it doesn't have a Supra labeled nib and the tip seems to be different to what is imprinted on the barrel (M instead of BL). It also has an unusual chrome clip. What makes me wonder is that a #6 nib and feed should not fit into a #4 section but in this case it's a perfect fit, no signs of later modifications. Could it be that Osmia put together pens from whatever remaining and available parts they had when the material restrictions kicked in in the late 30s (around 1938) regardless of imprints and model numbers? This said, I think we'd need a bigger data base because you find very little information on Osmia anywhere. Looking forward to see your new acquisitions.