10+: Erector Set (Mechano).
Under 10, CASCADE by Matchbox. I assumed it was long gone. My brother recently found it in his attic. He rescued it 20 years ago when he stopped by my mother's garage sale. He put it in his attic and forgot to pull it out for his kids when they were of appropriate age and he never passed it on to me (my kids are in college). It just arrived in the mail this morning. The video below is not mine but you get the idea (it was only available for a few years).
Under 10, CASCADE by Matchbox. I assumed it was long gone. My brother recently found it in his attic. He rescued it 20 years ago when he stopped by my mother's garage sale. He put it in his attic and forgot to pull it out for his kids when they were of appropriate age and he never passed it on to me (my kids are in college). It just arrived in the mail this morning. The video below is not mine but you get the idea (it was only available for a few years).