[pure-silver] Speed rating of glass plates

hello, 
Hope everybody is out burning film or sniffing hypo in the darkroom .  :)
I have a number of exposed 5x7 glass plates, they are portraits, family, children, couple, single, done in a studio. From what I can make out, i.e people sitting in cars... probably 1920's?????
Does anybody know what would have been the ISO of these plates? I also have boxes of 4x5 and postcard size SEED's glass plates that are marked, "High Speed" which would be what speed? 

Any historians out there???

Cheers,
Bogdan


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________________________________________________________________
 Bogdan Karasek
 Montréal, Québec                     bogdan(at)bogdanphoto.com
 Canada                               www.bogdanphoto.com

                    "I bear witness"
________________________________________________________________ 


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