i don't know what you have from no photos, but while the old iron might be good , most
of those old verniers had a miserable 25 grad vernier scale . starrett ,b-s, helios etc
all had those teeny scales . not just the calipers, but the height gages as well. fine
if you have 20 yr old eyes....but at 52 yrs i can't see so well.
i've seen b-s stuff
made all over the place -usa , swiss, england,germany . nothing would surprise me.
they rebadge stuff , even chinese now.
i would imagine it is in fine shape- a large caliper like that is seldom used in most shops. hopefully it has the 50 grads like a post 1960's would.