Yes, a first-generation Performer where you lift up the work surface to access the charcoal storage bin and the gas ignition. See this post; in the first photo, you can see the storage bin in the back and the 5 pound propane tank hanging below the frame.
https://inlandempire.craigslist.org/for/d/mira-loma-weber-ss-performer-green/6977586780.html
tvwbb.com
This post includes a photo showing another view of the tank. This guy bought a new tank to replace the old one.
I picked up a free 2000 performer with propane assist. I'm really committed to making the propane assist with the 5lb propane tank functional. Replacement regulator is cheap, and the proprietary rubber hose with orifice is in excellent condition. Main question: Will a propane dealer convert to...
tvwbb.com
The gas assist lights the charcoal without the use of lighter fluid or starter cubes. A burner extends into the charcoal bowl, you turn on the propane tank, and press a piezo-electric ignition switch at the top left corner to spark the gas. Weber still offers gas assist in Performer and Summit charcoal grills today.
Yes, appears to be missing the 5 pound propane tank and regulator and igniter. Also can't tell from your photo if the stainless steel work surface is in the open position or missing altogether.
Current Performers use smaller disposable propane tanks. You can buy new 5 pound tanks like the one shown in the second photo. The piezo-electric igniter should be available, but may be sold as a kit including the burner tube:
https://www.grillparts.com/weber/weber-performer-grill-parts.asp?product_id=10401
Weber sells the regulator hose with orifice and fastening clip for $113. The regulator is nothing special, it's the orifice at the end of the hose that you're paying through the nose for. And it's much cheaper, if any cheaper, from third-party sellers.
A lot of people really like this first-gen grill, but so much depends on what you've not shown...condition of everything else, the frame, the lid, bowl, the porcelain finish, etc.
Owner's Manual is online:
https://weber.mizecx.com/retrieve/s3/knowledge/WEBER_OG/55015/55015.pdf