Originally Posted by HanNatNana

When you click on the singer link that you posted, then single letter prefix, now click on the red-highlighted 'G-Series' which is about half way down the page on the right hand side. The pdf file will save to your computer, open it and on the 3rd line down is the numerical range....

G- 40001 90000 15 50000 January 8 1910

So it's a Class 15, with 50,000 serial numbers allocated on 8th January 1910 at the Elizabeth New Jersey factory.

'Tis a little confusing at first but after a few tries you'll get the hang of it!! LOL

Hope this helps?
Bronwyn :lol: