Doing a bit more reading on Frederick S. Holmes, it appears he was the pre-eminent NYC vault designer of the Teens and early Twenties. Remote mounting of the locks was his thing, although I have still been unable to find any early patent to that effect. At least as early as 1912 he was using this design, requiring at least two attack points to be made. Sometimes the timelock is covered but the combinations are always protected on the inside by steel plates. So far I have found he used this idea not just on Remington Sherman and York but HHM and Mosler vaults, though not all were round doors. So the similarities seen between the RM and York doors were all his doing. Doug