Pretty sure some teams did not have logos on at least some of their helmets when first introduced during the time period you mentioned. I don't know the history of logos on Red Sox helmets, but I recommend you post an inquiry in the game used memorabilia forum here. I'll add that, if this is indeed a game worn Bosox helmet from the time period you stated and you are sure it can be attributed to a specific player, it may be a fairly rare item -- especially if the Sox did not use logos initially and therefore their helmets from that time would be hard to identify without some reliable provenance. All the more reason to not risk overdoing it on the restoration. It's a cool and significant item pretty much as is.