help identify Kowa graphic / computar 210mm F9?

[Old-N-Feeble]

You can't tell by cursory inspection. There's a lengthy thread here on LFPI about this. There are three different formulas... 6/4, 6/6 and 4/4 (I think). You must count the reflections in both sets of cells. I've forgotten which one is the original Computar formula.

[Corran]

I have no idea how to identify a lens construction based off of reflections, I just don't generally care that much about such things. I did post this earlier:

...This 210mm GK shows 4 reflections on both the front and rear cell - one large, one middling sized, and two of equally small size. Oh, and one giant blob when oriented just right. Is this the 6/4 Plasmat design referenced?...

[Old-N-Feeble]

PM Dan Fromm.

[BarryS]

I've also got a 210mm Graphic Kowa and it fully covers 11x14 wide open, but without anything extra for movements. So that's about 450mm coverage.

[Corran]

Perhaps some serial #'s would help here, to figure out the relative age/design? I'll check mine tonight when I get back from work.

[Old-N-Feeble]

Perhaps some serial #'s would help here, to figure out the relative age/design? I'll check mine tonight when I get back from work.

Mine was serial number 220411.

[BarryS]

Perhaps some serial #'s would help here, to figure out the relative age/design? I'll check mine tonight when I get back from work.

I'll check mine too. I suspect a lot (most?) of these lenses are the same with some varying interpretations of coverage/illumination and reflections.

[Corran]

Just checked, the serial is 226551. 6000 away from OnF - I wonder how many they actually made?