Lucky you!
Can you shine a light into the key hole and see what shape it is? There are a variety of keys used for sewing machines.
http://www.treadleon.net/sewingmachi...keys/keys.html shows some
Need to buy a key for an older 99 shows some other and homemade ones. I've made some for bentwood cases.
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also made one from a skewer for my Weed.
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I purchased a key from Ace Hardware for a Pfaff K.
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My brother made one for my sister from an old skeleton key (don't have picture easily accessible). I also had a triangle key that I sent to my sister for a friend of hers, but it didn't work, as it was the wrong size.
If it is a square, one can find a flat head screwdriver to fit in diagonal corners to use. Sometimes a flat screwdriver can be used to open the bentwood cases. Before I made the one for the Weed, I tried some square screwdriver bits. I have some "security" bits and there are a few sizes of what look to be similar to Philips heads, but are only three-sided that would probably work for triangle shaped keyholes.
It looks like there are manuals for Two Spool machines at
http://woodlan2.wwwss40.a2hosted.com...ool-Manual.pdf and
http://needlebar.org/main/manuals/el...ol/1index.html
Janey - Neat people never make the exciting discoveries I do.