It's a model 27 from 1902. The machine looks like it's in good shape, most machines of this age have wear to the decals. Singer cases are usually very solid, even the very old ones, sometimes the veneer can crack or come off in places. The plate under can be replaced, my old Singer has a cross-veneer bottom, painted some kind of murky burgundy inside. Missing veneer on the exterior can be replaced. You can buy oak veneer, cut it into shape and glue it on. (I think the cases are mostly stained oak or pine) The machine needs to be gently cleaned, be careful with the worn decals, the will easily damage further. Maybe have a few layers of shellac on the finish if you plan to use the machine. Originally the guildings were covered with layers of shellac, but on used machines, it can be worn off in places.
The case will clean up well with the right type of furniture polish, maybe soapy water and a well wringed cloth on the inside. Be careful with the electrical parts too, the motor usually works, but the insulation on the wiring can be in terrible shape if they haven't been rewired. From the picture it looks like it's in pretty good condition, but check it. It looks like your machine once was a hand crank or treadle, and later convered to electrical. It looks like it needs a new drive belt. You can repair most things on this if you like the idea of it, they sew rather well too.