I thought maybe I had a similar numbered one like this last one in the garden, but when I looked at my photos, it's a 1bc. But as I was looking I came across my pics of Dots and Dashs, and your pic above is indeed it. (And you've probably already figured that out
.) It's been so long that I thought the cultivar had more clearly defined dots and dashes throughout, but I was wrong.
A scan of an old pic of Dots and Dashs: