This might be a placebo effect, since as
@Foo2rama stated above the case, caseback, crystal and bezel has remained the exact same dimensions (but not design) since the late 1960's. However, what might be influencing your perspective is the bracelet which has changed dramatically over the past five decades and 100% objectively effect the wear size and heft of the Speedy Pro.
And comparing the Speedy Pro to certain Rolex models is misguided since Rolex constantly changes the dimensions and materials of their lineup. Fatter lugs, ceramic vs aluminum, plexi vs sapphire, bezel width, case depth, etc. etc. are drastically different model to model.
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