Where does one look to find the model number on older Morse machines? All I can find on the machine I just found in the attic is "Morse Precision Zig Zag" and "Made in Taiwan". The machine is metal and the repair sticker on it is from a shop that closed at least two decades ago and the absence of a zip code on the sticker would date it prior to 1970. An image search has turned up nothing. Thanks in advance for your help.