I am restoring my late seventies Toker II bong (kind of like restoring and old car I guess) and noticed it had a US Patent Number on it. It is worth looking up on line. It describes a bong in legalese and is a bit of a hoot. Some nice drawings are included, You can look it up by number 3,882,875. I have a busted downstem and my rubber stopper needs replacement but I'm sure I can find someone who will make a new downstem for this classic. This bong was always a great smoke and I'm looking forward to using it again.
Any chance you could get some pictures of that piece for me. I would love to see them. My dad has an original also, but the name and patent are no longer there due to heavy long term love. Thanks for your time. I can't post pictures here, so if you have that problem I will provide direct email.