Yes, but the true bubblebacks (with convex outer case back) dated from the mid-later '40s. These earlier ones were thick but had a flat outer case back, but are also popularly known as bubblebacks. These early full rotor movements were thick.
Immediate post-retirement is a time for reflecting and contemplation. I'm sitting in the yard contemplating mowing the grass. Determined to participate in Speedy Tuesday instead. The grass is yet too wet with dew at 9:00 AM. Bound to be.