You are correct, I’m a fan of Beierschmitt or Beierschmidt. Both are in the GRIN database copied below. I know nothing about winter hardiness. The coldest I have ever experienced was -3F in north Mississippi in the early 80s. The description in the St. Lawrence catalog is incorrect - it is not a long-necked pear. I have photos in the Pear harvest 2023 thread here Pear harvest 2023 - #9 by Richard
GRIN:
"Accession Names and Identifiers
‘Beierschmitt’
Type: Cultivar name
EUROPEAN CULTIVAR
Type: Site identifier
Group: CROPTYPE
CPYR 1062
Type: Other or unclassified name
Group: LOCAL
Named for J.A. Beirerschmitt.
CPYR 1306
Type: Inventory
NSSL 423167
Type: Inventory
Narrative
Beierschmidt (PI 541455). Originated in Fairbanks, Fayette County, Iowa, by J.A. Beierschmidt. Introduced in 1927. Considered to be a seedling of Bartlett; seed planted by Marie Beierschmidt, mother of J.A. Beierschmidt, about 1900; first fruit borne about 1908 to 1910; original…"