My father bought sixty years ago a large lantern flashlight for camping, now I have not used it for years and but it still sits in the garage.
It had the red emergency flashing light on it also.
I am not sure you can get the type of battery it used.
We did a lot of camping back then and I do not ever remember it not having far, far more light than the standard 2 D cell batteries that all the others were.
He also used it in the garage when it had no electricity.
To this day if I have to go out and look for some thing on a new-moon night, although that has pretty much stopped, I have a cheap 6V plastic flashlight I got from the Fingerhut clearance store.
Because it is cheap, the internal connections may be on their last legs but I have had it for 30 years and it illuminated forty feet brightly and well enough I could see a black cat sitting sixty feet away and so I could go get old lard butt and carry him home.
Now I am one who gets attached to old tools and prefers to use/keep them till the second coming such as flashlight you got when could buy batteries and a flashlight came with it.
When my aunt died I found a cluster of unused battery-less little AA/AAA size incandescent flashlights in a drawer.
I was amazed at how well they illuminated compared to some old cheap D cell flashlights I had
My brother gave me a Maglight a few years back and for an old fashioned D cell battery it IS the best one I ever had but of all the new led or what ever their bulb is, small size, size of old C cell flashlights, only one is really, really good and I got that one for free some where.
It throws a light that actually reaches out, it does not illuminate brightly for six feet and then die like most of the others but those new style little AA flashlights I will admit are fantastic for looking in small tight places.
I WISH, GREATLY, that they made Lithium D cell batteries as too often I will grab a flashlight that has sat mostly unused for a long, long time and find it is not far from going belly-up.