Wow those are beautiful. One of my favorite bottles is a McMillan & Kester's because it has some really crude twists in the neck. I've only seen them in aqua, but I don't get out much ;-) Have you noticed at least 2 embossing variants on the aqua McMillan & Kester's? If so could you (or someone) post the two together side by side? Seems like I remember there is one that is written lengthwise, another that is written across the short side of the bottle...
I once dug a McMillan & Kester's with an IRON PONTIL. Too weird, eh? It went for over $700 on Pacific Glass Auctions, now known as American Glass. Just a cheezy, hugely common bottle with a VERY uncommon base finish.
As far as I know it was blown at San Francisco Glass Works and should not have been pontilled, but it most certainly had an obvious black iron oxide scar. Never seen one since.