Yeah. Around late 1968 / early 1969 all of The Beatles got this idea in their head that natural instruments without finishes would resonate better. As a result John Lennon had his Epiphone Casino stripped, and McCartney had his Rickenbacker 4001s stripped as well.
George Harrison also stripped his Epiphone Casino at this time. Here it is, just to the left of George:
Some other Beatles instruments in the photo include:
- Hofner Club on the left
- Rocky on the wall
- stripped cherry Les Paul above Rocky
- Ric 360/12 right behind his head

!! If anybody knows, I imagine it would be Paul's bassist.