I tried red faced severum, and got another name for rotkeil which do have a blue mask lol, so I am guessing the person is really advertising rotkeils, the only confusing bit was the bars.
Found a wanted ad on a site I cannot mention actually wanting red face, 5 bar, blue faced severum and ........ they are known also as Belem, managed to fine a pic and they look just like a rotkeil but with red bars on their face.
Yeah Ive seen the advert as well Belem are really stunning sevs one of my fav strains but also one of the rarest usually only sold through cichlid groups and most of them in the UK are in the east anglica cichlid group. So to see them on private sale is quite something especially sub adults.
On an other note I always thought that Minxys old green sev had a bit of Belem in it as they have slightly square heads.