Hey Josh - if you're just looking for a rule of thumb, Beckett's Monthly guide used to occasionally print pre-war pricing. I haven't bought a Beckett in a couple of years, but have one at home that has T206 pricing from 2013, I believe.
I know they didn't put it in every month (since I have a similar guide purchased a few months before or after that doesn't have it), but it used to be in some. I agree with others in that using it as a hard and fast rule is a bad idea, but the prices in there will at least give you a very rough idea if you can find a current one that has them listed.
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T205 (208/208)
T206 (520/520)
T207 (200/200)
E90-1 (120/121)
E91A/B/C (99/99)
1895 Mayo (16/48)
N28/N29 Allen & Ginter (100/100)
N162 Goodwin Champions (30/50)
N184 Kimball Champions (37/50)
Complete: E47, E49, E50, E75, E76, E229, N88, N91, R136, T29, T30, T38, T51, T53, T68, T73, T77, T118, T218, T220, T225
www.prewarcollector.com
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