Here is an older BR-S, from 2015.
View attachment 15556350
This anniversary model was actually a BR01 at 46mm from what I recall. This particular 01 novelty had a different case construction, unique for an 01 size model but built more like an 03 case; I believe screws in the back tightened and the ones in front were designed to be aligned. The aligned screws for B&R started when they introduced the BR-S models, and I believe the similar system was later introduced on the midsize BR03 when they moved over to ceramic cases. Old BR-S models the screws seated in the front could be manually adjusted, but the back is where it was tightened. The BR03 (and likely the BR01 anniversary) went a step further to make the front screws fit a square peg in a square hole to force alignment.
All older BR01 steel models kept the traditional case design where the holes were threaded into the case and screw head alignment was random. This is what represented the true feel of "cockpit on the wrist" where these days they've toned that down a bit, and they've moved away from the 01 cases entirely. The ceramic watches can't have threaded cases, so they used a screw on the back to anchor the screw head on the front. Hard to explain but if you look at the marketing renders where they blow the watch apart you can see what I mean. Over time, those front screws have moved from being pure function towards decorative, or something with more aesthetic balance in mind.
Edit: BR03 case construction, for example, note top "screw"/holes are square, back screws are round and do the tightening-
http://1.bp.blogspot.com/-7EkehJ5hq...YbFOkAorIQ/s1600/14517954374_2476eff2e5_c.jpg
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