Mystery du jour

[Csa]

Thanks. When I type in Philcotron in google I see many more examples. And like modern batteries, several cells are linked together in series to create enough power. Here's a screen cap of the radio full sized battery with ingenious +/- connector that a group of these would snap into. I guess the little 3rd opening was to top it off with the battery acid or water. Kind of cool, and now it goes back in the pile of valueless bottles, but at least I know what it is.

 

[Found a collection]

Since we have lots of mystery items lately here’s one more. Two identical 6 inch tall hazel atlas bottles with two line marks about 3/4 up. One has the top mostly intact and two metal tubes inserted, plus a 3rd empty hole on top. Baby bottle, don’t think so, embalming bottle, we saw that a few days ago, looks diff. Hygiene product? Lab equip?
Thoughts? Both have 5677 on one side of heel and C-546 on other side. Bottles seem like 20s or 30s but the cap indicates something earlier.
Anyone come across these before.
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I have to give my 2 cents, this may be faaaar left field: battery

 

[Found a collection]

I said that before reading on

 

[Csa]

I said that before reading on

But you nailed it!!