Paul unknown Apple visit
Apple Studios sometime February or March 1969
Photographer: Ethan Russell

More circa early 1969 mystery pics by Ethan Russell. (from the "Get Back" book)

This doesn't appear to be an actual session, certainly not as The Beatles. But, exactly how much time did The Beatles spend in the Apple Studio after the January 1969 sessions?"

Possibly dates noted by Mark Lewisohn in Chronicle:
5 February - Glyn Johns "Get Back" sessions mixing session
4 March - Glyn Johns meeting with Paul and John

Possibly dates noted by John Winn in Way Beyond Compare:
early February - at an unknown location (Apple?) Paul produced "Rosetta" for The Fourmost
11 March - Paul session with Jackie Lomax (but Paul's shirt is different - see here)