I searched the internet and only found the following REX manual, which may not be compatible.
Several searches showed attempts to auction that model of sewing machine and had mentioned Nakajima H-766651 as the same.
http://www.sewingmachinemanual.net/Sewing_Machine_Manuals/Other_brands/Rex-345-2L_Instruction_Manual.htm
https://picclick.com/Rex-Heavy-Duty-Industrial-Sewing-Machine-351-2L-Nakajima-122433442078.html
https://www.google.com/search?safe=off&client=firefox-b-1-ab&biw=900&bih=486&tbm=isch&sa=1&ei=l0mLW4OmLoSGsQXPjILoAg&q=351-2L&oq=351-2L&gs_l=img.3...36155.36155..37308...0.0..0.70.70.1......1....1j2..gws-wiz-img.dHENhY_K6zA#imgrc=zGQxVNgjkYG1kM:
Rex 345 2L Instruction Manual
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