Welcome to Quilting Board. I believe you have what is a 15k27. I am basing that on the descriptions at
https://www.sil.si.edu/DigitalCollec...es/image28.htm I have been told that the "
H.O." would be for the machines that were
Heavily
Ornamented. In other words, with decals. There is a Parts list for various 15K machines at
http://www.maquinasuniao.com.br/wp-c...%20to%2085.pdf
There is a comparison of the different class 15 machines at
http://needlebar.org/main/15chart/ However, I disagree with the blanket statement
Singer's Scottish plant at Kilbowie use the same model numbering system except that the 'dash' is replaced with a 'K',
While many of the later machines this would be true, it is not for at least one of the 15s. As seen at
https://www.sil.si.edu/DigitalCollec...es/image30.htm the 15K30 has a
wheel feed and
roller presser foot and would be considered an industrial machine.
The 15k27 would be very much like the 15-30 (the domestic machine made in the USA). From my understanding, the difference would be the way that the stitch length is moved. The 15K moves the thumb screw
up to lengthen the stitch whereas the 15-30 moves the thumb screw down to lengthen the stitch. Neither of the manuals is very good, but there is a 15K manual at
https://www.manualslib.com/manual/36...inger-15k.html and a 15 manual at
http://needlebar.org/main/sident/15.pdf
It looks like you may have made some stitches with the machine, but if it was threaded the way it is in the pictures, I'm not sure how. The first thread guide from the spool at the top, as shown in your pictures is for winding the bobbin. To thread the needle it should go in the back thread guide. I also see that you are use a cross wound spool of thread on the spool pin. This will probably cause tension problems. For a very good description of the differences and the possible solutions to using cross wound thread on these vintage machines (which were made for stack or parallel wound thread spools) can be found at
https://archaicarcane.com/standing-a...s-stack-wound/
Have fun with your machine. I like hand cranks.
Janey - Neat people never make the exciting discoveries I do.
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