The G & Co. can't be Guggenhime, because there is no dot after the Co in the G205. Your perfin shown is definitely G207 and was used by Goodbody & Co from NYC.
I revised the pattern and it didnt got a dot after Co so I still say it is G205 stands for Guggenhime as the perfin sent didnt contain dot I will add photos now, taking into cosideration that Goodbody & Co from NYC also use G&/Co but its different in form pattern so if one had a photo for this company on a cover we can see the difference as I still see what I send is G205.
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