My 6" calipers came in the mail the other day. I love them. Made in the USA Nork spring calipers. Made in Los Angeles. They are tight, excellent fit and finish, about 60 years old, and the action is very smooth and precise. Got em off eBay for 13 bucks including shipping.
I can't set em down they feel so awesome!
I'll collect a few more of these for my spindle turning.