Does anyone know what this brand is?

[Torchwatch]

The logo is not a Speedo swoosh and appears to be silk screen printed on..
Speedo do not usually have white stripes screen printed onto the sides of their suits.
Speedo usually use thicker and better quality fabric than used here.
It's not Speedo.

It could have been made by anyone with access to silk screen printing and was willing to make a suit unlined (unless the liner was cut out).

It is always better to make or buy an unlined suit rather than cut out a liner, a brief always looks wrong after a liner has been removed and there is a danger of cutting the fabric while removing the liner which ruins the fit.