The received marking on the reverse would have been applied to all incoming first class mail. Then when it got sorted and sent to the General Delivery clerk, it received the front marking. The importance of the *dated* general delivery mark is that letters were held for a limited number of days (depending on the class of the office) before being withdrawn and sent to the dead letter office.
One possibility is to identify the date the letter went into General Delivery. There was usually a time limit that the letter would be held in General Delivery. If not picked up, it would be returned to sender, or more likely in this case, sent to the Dead Letter Office, opened, and if possible, returned to the mailer.
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