Classic Update

Just back from another Florida trip. Only the one classic Gulfstream seen flying this time. G3 N400AA (362) arrived at Palm Beach on the 20th. A Mexican G2 was seen at Opa Locka which was probably XA-CVS. The following were seen at Fort Lauderdale Exec. G2s N721CN (206) and N1218C (99), G3s N36DA (450), N320MK (370), N500EF (400), N975RG (471) and XA-LNP (323). Another G2 defied recognition. Pic below. Any ideas?

Update: Info suggests this is N88LN (020) which was originally delivered to P&G as N2PG in November 1968, exactly 50 years ago. Thanks to FKL for this snippet.