Not sure whether a rebuilt klunker qualifies as an "old" bike. The frame may be old, but it really dates from when you built it.
Unfortunately, I used up every one of my '70s Excelsior klunkers, so I no longer own one from that era. The great thing about those old Excelsiors was that if you used one up, you could throw it away, and it didn't bother you until 30 years later, when you kick yourself for not hanging on to it.
Best I can do is my '78 Breezer #2. My wife owns a 1982 Ritchey, which I sold to her when it was new, and that's how we met.