Hey Simon -
Nice to see you piping in around here. There were a few uncollected odds & ends and uncollected tools floating around the Rec Center basement last I knew, but neither your chisel nor your Eagle square were among them.
I'm with you, if I had my druthers, stainless squares with 16th's on both sides of both the body and the tongue would be on the racks in every hardware everywhere...
I know a former CE who actually uses the 10th's, the rest of us curse them every time we flip a square. I get the 12th's, taught myself to step off years ago when I learned and briefly used all the tables on better squares. The traditionalist in me even appreciates their being there in some small way – At the same time I'd find my square far more convenient if it had sixteenth inch graduations on all its sides.
I've used Shinwas for pushing twenty years, have yet to try out a Chappell Universal, though I'm itch'in to.