Wow, that's kind of interesting.
I'd put that at post-'67, early-mid '68 by his hair style.
Yet I see what looks to be a shot from the same session at a Saualito hotel credited to legendary rock photographer Jim Marshall and dated as "Ca '67":
I suspect that's not a correct date, going by the photo of him with Richie Havens at the Café Au-go-go in October '67, and his endorsement shoot for the '68 Guild catalog:
He had that perm for most of '67:
Here's one that looks like a couple of months after the Au Go Go pic, hair's starting to grow out:
Here's a shot attributed to the
Wheels Of Fire sessions which ran into '68:
I'm willing to bet that pic's from the '68 sessions at Atlantic, as the recording sessions also included live recordings of concerts at the Fillmore West and Winterland during March of that year.
Sausalito's a little town across the Golden Gate from San Francisco.
I bet the hotel in question is the Edgewater, a popular haven for touring bands and scene of the Led Zeppelin episode immortalized in "Mud Shark" on the Mothers of Invention's
Live at the Fillmore East June '71.
And I think Mr. Marshall's estate has incorrectly id'd the date of the photo session, which can be forgiven after 40-some odd years...and the operative qualifier being being "
circa".
EDIT:
Ever since I first saw that photo of Richie and Eric I've had a pet hypothesis that that's where Eric actually got introduced to F50's, because:
I've never seen any reliably dated photos of him with one
prior to that, but suddenly we see a flurry of 'em within 6 months afterwards....