I have a few, just thought they were interesting (one with a snowflake logo) - but 4000!!!! Oh My Goodness!!!!
I've still got one from late 80s to early 90s, never played, in original packaging, looks like this:
Here's a cool website with a large, well categorized collection of TT balls, made as early as 1920s! http://www.tischtennisbaelle.org/english/suche_datum2_ausgabe.php?suche_datum2=1920er
when I buy a box of balls I put one ball into the jar for some time now
15 of them are the 38mm
Do you have a 38mm Halex 3 star made in England, the best ball of the early 70's.