I would think they are a bit later, more 1700-1800's? Also, I think both are 6 layer. One may have some contamination in the glass?

Have you seen this exhibit by John & Ruth Picard?

I'm looking for a reference, but the outer stripes are throwing me for a loop.

These are 16th century . Found along side the classic 7"s.

I am little surprised with the differing view points.

mine is substantially smaller then the Picards Exhibit types.

I have not made any conclusions,but as for now I am thinking that these could be the older versions of the 1700-1800 Aspeo beads.

(just like the typical 7 L chevrons that had a smaller versions at the beginning of manufacture. )