Last year for Pro Staff 3000 was perhaps '82 - the cat for that year does not seem to be on/listed at:
http://www.vintagearchery.org/ben-pearson---golden-sovereign.htmlbut used to be available via the Ben Pearson website before their announced closure Dec '19.
In my BPH60 text/pics I incorrectly said '78-'79 - should've been '79-'80 - corrected now, but even that was wrong!
After I wrote it I subsequently found it in the '82 Pro Staff catalogue ;-) in Jan '21 whilst looking up the evolution
of the "Ol' Ben"/5000 longbow.
Also the naming seems to have subtly changed which may be why yours has only the model no. & not the
"Pro Staff" decal .... so maybe yours dates to as late as '82 (haven't seen a Pro Staff '81 cat & it never seemed to appear in the main cat).
Here's the '82 Pro Staff cat page:
That BPH60 is 45#.