Antique? Map of Great Britain & Ireland

Antique? Map of Great Britain & Ireland. I do not know if it's antique or not but the material is not just thin paper. It's thick, somewhat stiff and has a texture to it that feels like something old. I purchased it from an elderly British woman's estate sale in the US and she said she purchased it years ago in England but didn't know it's age. It's in good condition and was framed when I purchased it from her but I removed it to see the back and I don't ship glass frames. There is some tape still attached to it from when it was framed. See pics. 1330