I also have a slightly irrational interest in old editions of said
maps. Were the old maps for sale at the LT Museum depot or did you nick
them? ;-)

The Friends of the Museum had a stall there, selling leaflets for 10p
each. I picked up most of the Ldn Connections maps though, but there
were some other ones from the 1980s left.
Next open day is in Oct & there was a stall last time I went, so IM
sure theyLL have one this time.
Also got line Diagram Stickers, Map Stickers (all still with sticky
back), old Timetables, other station signs & random leaflets.