Dating domestic sewing machine
You can substitute an earlier FR handwheel and put them in a treadle.
These were introduced in 1928 and were all electrics.
While traveling in America, he noticed a White sewing machine.
"This machine," he said to himself, "is magnificently designed and made, and very attractive.
The following White numbers were verified through the company.
You will note that there are irregularities in the stated sequences.