This is a great looking jersey but I really dislike the nameplate. Looks just like the back of a couple of recent replicas on ebay. There's a great shot of Lambert in a 74 rookie jersey with original nameplate on this youtube video:

http://www.youtube.com/watch?v=aSoyEH36hIU

This is the NFL films top-10 drafts, Steelers 74 #1. Lambert shot is later in the video, maybe 3:00 or so in. Maybe someone can do a screengrab. The "M" is clearly slanted-wide rather than straight-vertical. And, it's centered and slightly higher than this one. Jersey looks great to me but I wouldn't be surprised if this nameplate was years after the fact, and how can you authenticate that the nameplate was really put back on by the team. But I'm no expert!