I inspected a 1930 build and found this toilet in the basement. I would suggest that the drain waste line would have had to be installed after the original concrete basement slab was poured. As can be seen, the concrete floor was covered with linoleum, so it could not be determined if the concrete slab had been cut to install the drain plumbing for this toilet, a shower and bathroom sink.
The toilet was installed on built-up concrete with wood supporting the front of the toilet. The toilet was secure and functional with no leaks observed.
Any thoughts or comments?