The home we just finished up was a 1959/60 build time. It did indeed have the 1-3/4 x 2-3/4 studs. We have rebuilt 2 different homes years ago that dated to early 1900s that had 2x4s that were actually 2x4s when built and over time had shrunk to 1-7/8 x 3-7/8. As well as the 2 homes in the early 1900s the wood was so hard there was no pulling nails or driving nails. Had to pre drill and use screws after stripping the lattice/plaster off the walls/ceilings and going back with sheet rock.