I also have a set of Leitz binoculars, mine in 8x, with the fold up rubber eye cups. I can't even remember the year I bought them, but it was a long time ago, that's for sure.
They have pretty much sat in the safe, or been used as loaners for many years now. One thing they did do for me, was make me a lifetime customer of Leica. I do love the sharp clear vision the give!!
Respects,
Richard