Schneider is the manufacturer, Kreuznach is the city. So you're telling us it's a Ford from Detroit, and apo is some variation of a sedan model. What you really should be paying attention to is the model, which also will be written on the lens, like Apo-Symmar, for instance. Symmar is the actual lens design is what it sounds like from your description, with the modifier APO to show which of the several Symmar iterations it might be-- like a GT-Mustang, Ford, Detroit. If you ask for a Schneider lens, that could be about anything and Kreuznach means even less--Detroit.
So: 210mm f5.6 APO-Symmar, by Schneider, from Kreuznach. If it's a Symmar, it's only going to be from Schneider, and only from Kreuznach (with the possible exception of something called a Krishna version, which no one seems to have satisfactorily described exactly where those were made, at least with any authority as far as I've noticed), so those two parts of the description are basically irrelevant. Unless you're looking at a Krishna version, and then, who knows? A Korean copy, maybe? :-)
[early Dagor-type] Symmar, 6.8
[convertible] Symmar, 5.6
Symmar-S
APO-Symmar
Super-Symmar
Super-Symmar XL
Makro- (Macro-) Symmar
Have I missed any Symmar versions, anyone?
https://en.wikipedia.org/wiki/Schneider_Kreuznach
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