Do Old Hard Wood Floors 50 Years Ago Have Tongues

In a typical hardwood flooring installation the tongues of the boards must all face in the same direction.
Do old hard wood floors 50 years ago have tongues. There have been different thicknesses of hardwood flooring milled over the years and their wear layers are different. How to reverse a tongue groove wood floor. They are quater sawn square edge. Regardless of the whims of fashion wood floors have retained their enduring appeal particularly for those dwelling in vintage homes.
Above that i am installing oak plank flooring. At the same time mass produced 3 8 1 2 3 4 strip hardwood flooring was cheaply available at 10 15 and 20 cents per square foot respectivly. Unfortunately past home owners have painted some floors and stained others a honey color and carowted over others. A poor choice of hardwood by one generation is then foisted on the next.
Why most folk in this city of toronto chose the 3 8 strip saving about 80 dollars in the average house i have no idea. My question is related to the wide boards do not have tongue and groove milled into the. One key in determining how many times the floor has been refinished would be to look at the wear layer that is left on the flooring itself. The wear layer is the area above the tongue and groove.
I have a rather large pile that came with the house. After nailing the tongues of one course. But the victorian and craftsman revivals of the late 20th century saw a renewed interest in hardwood flooring along with the use of reclaimed lumber to replicate early floors. The floors are 2 thick and range from 6 12 wide and about 15 long.