Bizarre - but true! This pack of 6 balls conform to official size and weight rules for golf balls and are of a standard 2-piece construction.
What's not standard is that each is has a facsimile of a bank note clearly visible underneath the hardened varnish - eg a $100 bill, 100 Deutschemark note (they were obviously made pre-euro), a UK £20 note a 1,000 yen note, etc.
Who are they suited for? No idea. A stocking filler for a golf-mad money broker perhaps?