Re: Vintage Arrow ( Toy? ) Telephones
There were many similar units, sold as toy intercoms (e.g. between a child's bedroom and their parents). Most of them (but it appears not yours) had some kind of calling switch that you operated to sound the buzzer in the other telephone. In one of my sets it's a contact operated when the imitation dial is off-normal.
But anyway. The most likely candidate for the battery is one of those flat 4.5V units with the brass strips on top. I knew it as an 1289. Is that a 3LR12 now? Try one in each telephone.
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