Bison
Grosz states the following
C.1225/16 - C.1250/16 C.VII (26)
C.1251/16 - C.1275/16 C.V (25)
C.1276/16 - C.1374/16 C.VII (99)
Don't know his sources, but his reputation comes with the territory

, so what proof do you have??
Alien
If you look at the two digits after the slash in your Datafile you will see that your C.V 1388 is in fact /17 and NOT /16
Cheers
Stig