Indicia title is "MICKEY MOUSE AND THE SUBMARINE PIRATES, No. 141." Code number is M.M.O.S. #141-473. Copyright 1947 by Walt Disney Productions. Apparently Mickey Mouse #3. Credits for this issue based upon Alberto Becattini's "Disney Index - Dell Comic Books" Vols. 1 and 2 (Italy, 1992 and 1994).
When his nephews fail their history class, Mickey decides to try to teach them with pictures. He builds a device to convince them that they are actually viewing the past, but it is switched with a device that can actually do the job.