Yeah, it was a Nemrod. It's not quite as clear-cut though - there are two slightly different holster styles from that era, and also the front part of the holster that held the dive knife was cut/ground off, which in turn removes part of the logo area.
The Bespin Guard used pretty much the same holster as fett, though the Nemrod logo was covered or ground off. My understanding is that ESB Fett also likely had the Nemrod logo covered/removed too, just the outline of the logo visible - not the detail HT has done. Though I wasn't focused on Fett's holster, only the guard.
It doesn't make a whole of sense propmakers would leave a logo displayed on the outside of a holster like that, though there have been vestiges of logos left on some SW props (the logo on the Biker Scout helmet, needle on Interrogation droid etc)
I scratch-built a 1/6 Bespin Guard Nemrod holster not too long ago so I've been looking at ref pics of Nemrod holsters WAY too much.
This pic shows how I tried to match what it looks like - the outline of the logo, but cut off because of removing the knife sheath: