The lever boss code was only used for select years. Being yours is a detachable magazine model and the absence of a boss code letter I would presume the serial number on the rifle starts with a letter. We have a chart you can use to date your rifle by the serial number for those with the letter prefix which can be found in one of the stickied threads in this board.
The only other explanation would be that the rifle was reblued at some point and during that process the lever boss code was polished out.
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