As said above, they are indeed legitimate.
A nice oddity for any '78 Topps collector or Eddie Murray fan.
Scholastic book Club and Topps teamed up just for that issue (#47). The "set" contains three different panels, your's being the most valuable (as it has the Murray RC). I would estimate it's worth about $50 (with the magazine) as long as the panel is in good shape (NM).
-Owen
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1955 Topps 171/206 
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