During the 1920s, Remington Arms Co., Inc. moved their Remington TRADE MARK logo off the action bar and put it on the side of the receiver along with the model number. Pretty soon they quit using the BO and moved the serial number to the side of the receiver as well.



They were not very consistent on where they stamped things on the left side of the receivers either --



I suspect the serial numbers and logos on Model 10s did some similar moving during the 1920s, but I haven't studied it.