Back in the 70's I bought myself an Elna SU62 which was blue and not green so maybe a bit newer. It had cams to go with it and it sewed so beautifully. I never had it in a repair shop in all the years I had it. It traveled thru many states with me too. Think the only thing that broke on it was the little white square knob you moved sideways but now can't remember what it controlled. I sold it like an idiot in 2000 thinking I didn't need 2 sewing machines as my new one was the Viking Designer 1 combo. I tried to buy the machine back for twice what the gal paid me but she wouldn't budge, she wanted to keep it.
These machine are basically all metal inside except like the little white knob and the cams. Loved that the case doubled up as the table too. The case is metal too so strong. Still wish I had that machine back.