AI-assisted community identification

Transition Slag

M.F. Christensen · 1904-1917

Transition Slag by M.F. Christensen, identification view
Community photograph · added 9 June 2026

Identification summary

An early American transition marble made by the first successful machine-made marble company, featuring a single pontil-like cut-off mark.

Visible record

Maker candidate
M.F. Christensen
Era
1904-1917
Pattern
Coreless Swirl / Transition
Rarity assessment
Uncommon
Condition assessment
Poor
Size
Player (approx. 5/8 inch)
Material
Glass