It's been a while since I got a Senns headphone and my name is still on first post I just got quite old Sennheiser HD 555 in very good condition for very cheap price. Immediately after I got it I know it sounds rather wrong and remove the foam to make it effectively HD 595. With that pesky foam gone it really sounds wonderful especially the lower frequency. Quite surprise the headphone is very comfortable and very good wear with glasses.

They are not as good as new ones but there is something about old headphones, I still hunting for classics like AKG K501 but I didn't see them anymore.