Its a Squier Standard, but I just realised I measured without taking the bridge cover off so it probably is 19mm... Sorry!
No I mean the Fender Performer from 1987. I haven't got it handy to measure, but I do know it's 53mm at the 20th fret compared to 63mm for a jazz, so 10mm less neck(!) there could mean it's even less than 3x3mm less at the bridge (scaling from a photo suggests 15mm but I'm not 100% sure). Possibly the skinniest-necked bass ever made by a major manufacturer?