Atlanitc Model Haplogroup and Henwood Line

This is from Wikipedia.

You will see that only our DYS 390 differs in that we are a 23 instead of a 24.

In human genetics, the Atlantic Modal Haplotype (AMH) or haplotype 15 is a Y chromosome haplotype of Y-STR microsatellite variations, associated with the Haplogroup R1b. It was discovered prior to many of the SNPs now used to identify subclades of R1b and references to it can be found in some of the older literature. It corresponds most closely with subclade R1b1b2a1a [L11].
The AMH is the most frequently occurring haplotype amongst human males in Atlantic Europe. It is characterised by the following marker alleles:
DYS388 12
DYS390 24
DYS391 11
DYS392 13
DYS393 13
DYS394 14 (also known as DYS19)
A common haplotype within R1b is sometimes called the Atlantic Modal Haplotype, or haplotype 15. It reaches the highest frequencies in the Iberian Peninsula and in Great Britain and Ireland. In the Iberian Peninsula it reaches 70% in Portugal as a whole, more than 90% in NW Portugal and nearly 90% in Galicia (NW Spain), while the highest value is to be found among Spanish Basques. It was discovered prior to many of the SNPs now used to identify subclades of R1b and references to it can be found in some of the older literature. It corresponds most closely with subclade R1b1b2a1a [L11].
One mutation in either direction, would be AMH 1.15+. The AMH 1.15 set of haplotypes is also referred to as the Atlantic Modal Cluster or AMC. Often 1.15+ would be in the R1b1 subclade.