Mr.Fixit;
The peep sight is the original rear sight. The DL's of any bolt action Marlin rifle came equipped with a peep sight and sling swivels. That was the difference that made them the DL, over the standard version of that model.Regnier (gunrunner)
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Above taken from Marlin-collectors.com
Not sure if it's a DL, nice just the same. Here's link to Marlin Collectors Association where I posted concerning the Model 80DL, Hope it's of some helpful info to you. Mr fixit
http://www.marlin-collectors.com/forum/viewtopic.php?f=4&t=5030