Actually, it is entirely possible that the old birds of 1890 laid only 180 eggs per year. That is roughly six months. Those six months would roughly correspond to the six months of increasing light and/or fair amount of light. The bird would certainly meet it's obligation for species perpetuation and then some, if it laid 180 eggs per year.
The imagined praire farmer of 1890 in South Dakota likely did not expect eggs from November through February. They'd freeze anyhow, if not collected quickly. The association of fasting during Lent, ie, roughly the 40 days of February and March, was culturally interesting because fasting you were likely going to do, no matter what. You weren't getting egg and you were out of meat anyhow. LOL
The eggs are associated with Easter and the advent of spring, likely coincided with the return of egg laying anyhow. Just some rambling thoughts.
I too have GS Barred Rocks. I often tell people who seek true, rare, heritage fowl that they might consider whether they are truly what best meets their expectations and needs.