I am trying to find approximate dates for when the Fraim Company used the markings it stamped on locks and keys. I have the order in which they were used, but not a time frame:

ET FRAIM & CO.
FRAIM in keystone logo
FRAIM inside a banner / bowtie
FRAIM lettering in an arc
FRAIM lettering in a straight line

I don't need exact years, just an approximate time period, to help date several padlocks and keys.

I have been able to find company history, i.e., the men involved and important dates for the company -- but not for the markings/logos they used.

Thanks in advance for any assistance !