Hello from Belgium

[BRIT]

hello,

the reason why I have signed in, is because I've some investigation to do.

I recently bought 2 Rolex, and some other exclusive watches (Cartier, Breightling, Longines, Philippe Patek, Porsche) in an auction of furniture, jewelry and watches, no papers were included.
Some were fake, some not.....

The authenticity of the Breightling, the Cartier and the Longines are confirmed. Also the authenticity of the antique furniture. The 2 Philippe Pateks were fake
The Breightling was the most easy to identify; it had stamps on it which almost proved to be 18K gold. Few fake watches are made of 18K Gold.
Now I'm looking for description of details to verify the authenticity of the 2 Rolex.

Description:
They both have a twinloc

one is a submariner, Gold with blue.
year: approx 1990
inscription on the back of the case: 455 B
No indication on the back, no "Rolex" and it has a stainless back
inscription on the watchband:
78448
Rolex
Geneve swiss made
Rolexsa
18k
750
-Shield with something that looks like a snake- an upside down crown-
Crown on the

nr. 2 is a gmt-master
year: approx 1990
Stainless steel with gold
Black-Gold
Only inscription on the back: a crown and "ROLEX"
inscription Watchband: stainless steel

Are there details to see if these watches are real Rolex?

Best regards