I remember back in November 1985 when the Fort McHenry Tunnel first opened, there was a BGS somewhere over I-95 north of I-695 (i.e., inside the Baltimore Beltway) listing distances to upcoming interchanges and one of them was I-83. I didn't know back then that I-83 had been planned to be extended through to I-95 on the far side of the tunnel, but I did know that I-83 did not in fact meet I-95, and I commented on it. That's why I remember the sign: My parents told me to shut up. I don't remember where that sign was and I've never seen a picture of it.
I do not remember that, and I used to come that way fairly often to go to Orioles games at Memorial Stadium. Nor any mention of a junction with I-70 either (it would have been on I-95 N at the Baltimore City/Baltimore County border near Caton Avenue or slightly north of there).
One of the preferred routes to Memorial Stadium was I-95 N to I-395 N to Martin Luther King Boulevard N to N Howard Street N to E 28th Street E to Barclay Street N to the municipal parking lot at 33rd Street and Merryman Lane which was always free for night games and a short walk to the ballpark.
The other real peculiarity I remember from back then was that the BGSs on I-695 for I-95 into the city had blank Interstate shields—that is, standard blue shields with the red top and the word "Interstate," but no route number. I've never been able to find a picture of any of those. I always assumed that the reason the number "95" wasn't posted was to reduce the risk of motorist confusion whereby someone would see I-95 and assume it was the road north to New York only to wind up at a dead end because the tunnel wasn't open yet. (I vaguely recall a trip to the Baltimore aquarium in the early 1980s on which my mother insisted on taking the Baltimore–Washington Parkway because she knew I-95 in Baltmore wasn't finished, she wasn't sure where it ended, and she didn't trust the paper map we had to be up-to-date.)
Those I remember well. Those shields without a 95 were at all the movements from I-695 to head north onto I-95 (not completed before 1985 when the Fort McHenry Tunnel opened). These date back to the completion of the "Between the Beltways" part of I-95 between I-495 and I-695. There was plenty of Baltimore City buttoncopy on I-95 in the city too, but by 1990, MDTA had taken over full responsibility for I-95 and I-395 in Baltimore, from the city, and not long after that MDTA started replacing the buttoncopy signs.
An added twist - when the "Between the Beltways" segment was complete in 1971, I-895 (Baltimore Harbor Tunnel Thruway) was not yet constructed by MDTA between its original southern terminus at U.S. 1 and its current southern terminus at I-95 in Howard County (the only section of toll-maintained mainline in Howard now and then [short sections of the ramps connecting I-895 to U.S. 1 have been in Howard County since 1957 when what is now I-895 opened to traffic]). By about 1975, I-895 was extended south to I-95 (and at that point fully signed as I-895).
The routing for I-95 N (starting in 1971) was onto I-695 OL to I-895 N (Exit 8A now), through the Baltimore Harbor Tunnel and re-joining I-95 at the northern I-95/I-895 interchange.
I-95 S to I-895 S (present-day Exit 62) through the tunnel, then taking the sharp ramp onto I-695 Inner Loop (present-day Exit 3) to I-95 S at present-day Exit 11B.
Prior to the completion of the FSK Bridge, there were plenty of signs advising HAZMAT loads and overheight trucks to take I-695 "over the top" past Towson as an alternative to I-895. After the FSK and its Super-2 approach roads opened in 1977, the signs encouraged trucks to take the FSK (and allow MDTA to collect toll revenue from the trucks that were banned from I-895). It is still signed that way today.