http://www.ducati851and888.com/showthread.php?8911-how-to-ohlins-fg-9050-9051-rebulding
ducati made a recal in 1992 for sp4 and sp4s,to change ars seals with nok seal.
circolate tecnica 266/1992
in the post who i linked you can find this circolare tecnica.
in mine 9051(888 sp4) the bottom leg is marked "oram"
oram is a official ohlins deleader for the italy.
they mark the leg to indicate it was recalled
😄
ciao
tiz