Gilbert Gottfried was hard at work just a few weeks before his death — and we’ve got video of one of his final on-screen appearances … where he looks as spirited as ever.

The President of HollywoodOffices, Brad Folb, tells TMZ … his company hired GG March 16 for a Cameo-styled ad through a company called Memmo — which allows you to book celebs for any type of shout-out you might want.

In this case, HO was in the market for a personalized message from a “know-it-all” star who would be instantly recognizable — and they quickly landed on Gilbert. Seeing how his voice is one of the most famous in La La Land … they thought he’d be great.

Folb says they sent Gilbert instructions on what they were trying to communicate in the video — namely, that you’d have to be a dummy not to rent office space from them — but there was a no-rules rule in place for the guy … so he could express that any way he saw fit.

Welp, Gil produced exactly that … and did so with hilarious results. We’re told the folks at HollywoodOffices were more than happy with what they got from him — a gig that cost ’em about $1,300.

Seeing how a lot of their clients work in entertainment, Folb tells us he feels like Gilbert’s ad was as good as it gets — and, of course, it was so freakin’ funny … in true Gottfried fashion.

As you can see … the dude looks and sounds like his old self, and surely seemed to be in high spirits — which is why his passing was as shocking as it was. His family announced he’d died Tuesday after a long battle with a heart abnormality called Ventricular Tachycardia due to Myotonic Dystrophy type II.