Thank you gentlemen, if anyone else would like to chime in
😁
I don't have or had this particular 1500 model before, but I did have many normal 1500 models, both the 006 and 013 versions, and they looked in detail similar as your pictures (as far as the hands, dial finish and color, bracelet, etc. are concerned).
So I checked around on Google and found this info in spanish:
"Specialist Series 1500 GMT
Caja: Acero pulido con chorro de arena.
Bisel GMT: Acero pulido con chorro de arena.
Esfera: Negra o Blanca
Corona a rosca.
Cristal de zafiro.
Movimiento: Cuarzo
Calibre:
ETA 255.266 con un diámetro de 11 1/2.
Indicador de fin de vida de pila.
El brazalete de acero (acabado Blasted y pulido) tiene la referencia: BA0606"
When I checked out the ETA 255.266 movement it indeed has 6 jewels, not 7 as your friend mentioned.
With all that info I am 99.99% sure it is legit, one tiny thing that doesn't make it a 100%:
the black color of the circuit on the quartz movement should be blue and TAG Heuer signed originally, but could have been easily replaced at a later time.
Hope the info helps!