Looks like Precision brand goes back to 1979 or so. Still in business, call them.
No idea how to date Starrett, except look thru catalogs to see when things were offered with that part number. I like to start about 1930, and skip around from there.
archive.org
Value, I can buy all those for a buck or two at garage sales, so not real high to the average person. But probably big $$ online on eBay or Amazon.