: Is this really a 7753T, or should it be a 7753ST ?
: I also question no "T Swiss" or "Swiss" on the
: dial.
: Mr. Moss, comments please.

Well, it would never be just ST - silver is considered a default dial for the first gen and is only ever used as a suffix if there is nothing else to say about the dial. Hence the D suffix means silver dial with decimal scale, T silver dial with tachy etc and plain silver is simply S. With the 7753 Ts, it looks like early ones are all silver/silver and it's possible that silver/black becomes the default late in the production run, in which case it could be that they were simply referred to as 7753 Ts. If the silver/black dial was optional before that, then it should conform to the schema used internally of (dial colour:register colour:scale) and be a 7753 SNT in the same way a black/white dialled example is an NST. Externally, the references may well have been presented as the usual T and NT on the basis that as long as the customer got the dial they wanted, no-one externally much cared what the suffix was.

The absence of Swiss is pretty unusual though. I only know it on the Belgian Congo 7753s and a few of the ones with promotional dials where the logo obscures it:

For a normal production dial to be missing it perhaps speaks of some refinishing having been done.