yes, it is a Singer Letter A. It is "almost" Civil War 1865
All early Singers have two numbers, one is the serial number the other (the lower number numerically) is a manufacturing tracking number. The fun part about this is the ISMACS DB only goes back to 1871.
great Guess!!! I am impressed
here are a couple more...
The Machine
[ATTACH=CONFIG]523669[/ATTACH]
The Treadle
[ATTACH=CONFIG]523670[/ATTACH]
The foot pedal
[ATTACH=CONFIG]523671[/ATTACH]
and one of my favorite parts. the pitman.... WOOD...
[ATTACH=CONFIG]523672[/ATTACH]