Charlie Gillingham

"I’ve been playing a [Hammond] B3 for a long time, and I know how to do a lot of different things with it. I know how to shape the sound, how to move it somewhere, make it go. My hands know what to do. Especially piano. You can always find a place that works with the singer on piano."

"I have a really nice Vox, an old Vox Jaguar that I love to play."

Mentioned in this Reverb.com interview. Although Gillingham himsel fdoe snot explicitly mention the M400, the article offers a labeled picture of the model next to the following quote.

I do use a lot of Mellotron. I like Mellotron because of the atmosphere. The thing I like most about Mellotron is that it’s very difficult to play, right?

Visible in this photo of Gillingham.

Used for the harmonica on "Washington Square", as is visible in this video at 2:52.