The Model "A" seems to be the predecessor of the Super 63. I'd guess it dates from the 1930s. Although it looks superficially similar to the 63, I've yet to discover any interchangeable parts! Maybe the needle and the odd washer! I've got 2 incomplete ones and managed to put together one working airbrush, but I've an air leak from the cap, which is likely to be the nozzle washer. But for the life of me, I can't get the nozzle out! There are no flats to facilitate removal, so I'm guessing it's a push fit, but I can't get it to budge. I've ordered some small pliers, but wondered if anyone had any direct experience of this model (or this problem) and would love a diagram if anyone has one. Thanks for reading!