Singer vintage machine I.D. help

[Wyowally]

I've been asked to come look at this machine. They say they think it is "out of time". I can time almost anything, if that is the problem. Can anyone tell me the model? Any suggestions or resources? Thanks!

[BlackDragon]

Google image search says it's a Singer 7-33.

https://www.google.com/search?vsrid=CMGasciNpZWkahACGAEiJDA3ZDlkMGM2LTVlMDMtNGRiYS04NThjLTA3NDMzYjljNzZhYTIGIgJnaCgKOIz6m8nV9o8D&vsint=CAIqDAoCCAcSAggKGAEgATojChYNAAAAPxUAAAA_HQAAgD8lAACAPzABEIAIGIAGJQAAgD8&udm=26&lns_mode=un&source=lns.web.gisbubb&vsdim=1024,768&gsessionid=24dj2mh4nfiLTSphHqJfHudhqACKQKBxlDVm2yspEKbM25XhmrRn0A&lsessionid=U9iFFpQDbhz8KncIZ7XjX8c_1DDP_O5CbKsLDwO4GzJa1yPHkLRbRA&lns_surface=26&authuser=0&lns_vfs=e&qsubts=1758897977399&biw=1920&bih=903&hl=en#vhid=v6WRbHUhptf8PM&vssid=mosaic

Here's the pdf for it. The 7-31 is similar to the 7-33 and uses the same manual.

http://hensewfiles.com/PDFs/SINGER 7-31.pdf