These were inexpensive revolvers usually found in .22 rf, and .32 S&W.
You ejected fired casings by pulling the cylinder pin and cylinder, and poking the empties out with the pin.
They are listed in the 1902 Sears catalog for a few dollars- about $3.95. Missing parts and grips, yours is about $10 or so as a parts donor. Out of production by 1942.