For a tick, I found myself scratching my bald pate - I have personally described untold hundreds of Ser Jacopos and have yet to run across an L3 finish. Then I found my answer in the form of a red coral dot on the stem - the Ser Jacopo mark from the company's founding in 1982, until the switch over to the present "J" in 1997 (I started describing SJs in 2005). The shape is mighty attractive, and reflects fewer differences in aesthetic from Mastro (the original Pesaro school firm, one founded by Giancarlo Guidi as well), than we see in later Ser Jacopos. The stripes on this bent Dublin are sweet as well; if straight grain was sugar, I'd be in for a $900 dental bill from my 90 seconds of holding it.
R. 'Bear' Graves