I wonder whether this might be relate to a Civil War soldier? I found a number of Louis Hartmanns who served in the Union Army.
Guaranteed original 19th century piece. CONDITION is perfect, no chips, cracks or repairs.
Provenance: a Lancaster County, PA sale. Cobalt blue blown Steigel type glass jar engraved Louis Hartmann 1861" is in sale since Monday, August 26, 2019. This item is in the category "Antiques\Decorative Arts\Glass\Jars".
The seller is "truthbeautypower" and is located in Lansdowne, Pennsylvania. This item can be shipped worldwide.