Framed Reverse Nautical Chart Printing Proof – Mississagi Strait & St. Joseph Channel – Great Lakes Maritime Map

Large framed reverse-image nautical chart depicting Mississagi Strait to St. Joseph Channel in Ontario, Canada. This appears to be a cartographic printing proof or hydrographic chart production master, featuring mirrored text and white linework on a sepia background. Professionally framed at a later date and highly decorative with industrial maritime appeal. Features detailed soundings, navigation markings, compass roses, and shoreline information typical of official hydrographic charts. An unusual and visually striking piece for nautical, coastal, or Great Lakes decor. Condition consistent with age and display use. Frame shows minor wear. Backing paper present. See photos for details. 39"x33"x2"