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One or Two pipe System

I recently purchased a Victorian home in upstate NY. The house was built in the late 1800 early 1900 era. I am hoping someone can help me solve a confusing issue i am having. The main breaks off the boiler in two directions (front and rear of home) then again (left and right) from there every situation is the same. The main will tee off a bull with one vertical for the riser and the other for the dry return. The riser will tee off for a first floor radiator then continue to the second floor radiator. The second floor radiators return condensate threw the the supply (one pipe), the first floor rads return condensate from threw a pipe on the opposite side of the rad. (two pipe) with no trap, drop down and tie into the dry return. (which is separate from the main). That all being said all the radiators heat fairly equally, with no hammer. It doesn't look like the system was modified. I am new to steam heat but not naive to home heating. Has anyone ever seen a system as i have described?