Gentlemen
Your observations are very keen.
Mark F. also had similar points of interest.
I had cleaned these clocks a few years back, placing the engraved plate movement, into the other case, for decoratorative purposes.
Based on the now obvious findings, the movements shall be replaced as found.
Case # 396 has movement # 792
Case # 728 Has movement # 409
When found, # 409 was inside # 396.
These originated from the Bank Of New York.
I recall then, seeing very faint scribed #'s, & initials of BONY , on most parts.
Erik