In the Lancaster area, the lines were painted on with black ink, after staining but before any sealer. The lines have a slight fuzzy edge to them. Jack Brooks believes Leman, as it was a factory operation, used a large brush with sections cut out so they could do 4 or so lines at a time. I have a Leman and the stripes do suggest a pattern.
In areas east of Lancaster, the stock was sealed first before applying the lines giving the stripes a distinct edge.