ONE of 1,025. There were only 1,025 No. I MkVI's made. Yes, I have one.
https://www.milsurps.com/showthread.php?t=3828&page=33
Post 329. It's in the bottom right, low rack. That stack of 5 was called, in this display "No. 4 Predecessors", which consisted of a No. 1 Mk III, No. 4 Mk III*, No. 1 MkV, No. 1 Mk VI, and a Trials No. 4, 1930 model.