From testimonials, etc.

Paragon 552 bought 1-1-1902

Paragon 557 talked about in April,1901

Paragon 572 talked about in May, 1903

All we can do is interpolate from things like this. Your 518 must have been made in 1900 , but we know exact sequences were not followed perfectly.

http://www.bakercollectors.com/