Schon shaft engraving question

[MorganMan84]

I know most recent schon shafts have the name on the wood but what models had the black collar engraved “Schon” and “Schon 13”

Anyone know the dates or ranges.

Thanks in advance.

 

[Johnny Rosato]

1993. Joint pin was different also, still 5/16x14 though.

 

[chuckpilegis]

Schon 13 meant that it was 13mm at that time around 1993