Thanks CD! I saw your "Paddy" on your site, I thought that was really interesting that you've turned it into a treadle! I STILL haven't sewn on a treadle but I'm convinced some day the right one will come along.
Thanks for the information - that jives with most of what I found online. I might email Singer to see if they have anything to add; if I do I will report back what they have to say.
From what I've read, needles that fit the 306 should fit the 319, but obviously I haven't tested that.
It IS a nice looking machine, I'm really pleased with it so far. The paint is nearly perfect and so far I haven't found any problems. It needs a new belt (which I have) and I noticed one of the screws that can limit the bight is missing, but that's not a big deal. I'm looking forward to sewing with it this weekend, hopefully the needle it has isn't too dull!