I thought Roger Manning's M-4 was pretty much cherry, too.
This is the one that was in England I am pretty friendly with Richard Chamberlin and I was going by his words that his father made one 300 only. Weather two or more were built or not I can not confirm but it has been said by others for years that only one was made. The are several 300 remotes out there as I owned two of those. A few of the 300 remotes were converted to standup machines. I also own a mint M-4. I think mine is the only survivor that is clean and original. In any case, my old 300 blew away sound wise my Trons and all my M-1’s I just did not like the way it looked. I still go for the Mellotrons in white. I do not even like the MKII for the same reason. Those older machines remind me of garage sales. MY former Chamberlin 300 was also restored perfect without any new finish or remade parts. That means a lot to me but still it was too early for my taste.