Another difficulty with MN named machines - Sears often gave the Mfg specs to follow - so they may be a bit different looking than what you'd otherwise see for that company.
It is what helped put Davis out of business. Sears wanted a machine that looked like a Singer - and gave the contract to Domestic as they could do it. The Domestic that Sears sold looks nothing like the earlier Domestic made machines (both are before White got Domestic). The Domestic even took the same shuttle and needle as Singer, that is what the customers wanted.