Many of the smaller one's had plain bases, as I can recall. Our collection is still boxed up from the move...just had no time to unpack it. But it would makes sense for Pacific Coast as Owl Drug was a San Francisco based company. The KT-1 collection will always be popular to collect. Though, they are fairly common, generally, they still usually command a good price due to their ongoing popularity. They did have many bottles for other uses other than the poisons. We would like to get a few more of the other bottle types as well sometime. But other things are taking the front seat these days. I do miss the hunt...