I became curious as to whether or not I had overcast attachments for any of my machines. Hit paydirt with my Elna SU and Elna 7300. The SU overcast foot is exactly like the ones you have Joe. The 7300 is a snap on foot but it does have two wires that the stitches cross over. There is even a little bristle brush to the side of the wires. Must have some purpose but unsure as to what it is.
Gone on your road trip yet???