Film Exposure Rating for Those Brownies

I've exposed test rolls of Plus-X in both of the previously mentioned No. 2 Brownies and pull processed one stop-- E.I. 64. The older camera yielded much better results than the other; which would probably have well tolerated full development. Undoubtedly, more test rolls required.

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But this gives rise to the question of ASA (now ISO) ratings for the era in which these cameras were manufactured. Was 125 rated film available during the late 1910s and '20s? Or was ASA 50-64 more in line with the technology/chemistry of the day?

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Many thanks again!

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Wes