It's a
306, and some have taken it on and has it as their main machine. Others prefer searching down the later 400 number models like a 401. I'm sure members here on QB will give you first hand info on it. At the right price I would buy one with out hesitating. Originally it took needle system 206x13 and it will be damaged by any other needle unless the needle arm is adjusted for a 15x1. I don't really like the case it's place in and I think it's missing a spool pin, but it will not harm the machine in any way. Ask the owner for a stitch sample if you want to use it as soon as possible with out too much repair and fixup. I wonder what happened to the original casing ;- )