where can I find a manual for my Gimbels Deluxe Automatic zig zag sew. mach?

I have an old Gimbels Deluxe Auto. zig zag sewing machine. I have the front and back cover of the original manual, but do not have the inside. Can you please tell me where I can find one. The only numbers I found on the machine are "sk 3 5187" I do not know if that means anything. The front of the manual is blue with "Instruction Manual" written in white across the top. There is a pink strip across the middle with "Automatic zig zag sewing machine" written in black across the middle. There is a white outline of a sewing foot with a white zig zag line coming out and going across the page to the right of the foot. This is the background of the front cover of the manual. If you can help, please let me know. Thank you.