✅ SOLVED Can somebody help me with a backmark please?

[Mud Hut]

I seem to have misplaced my book on backmarks and would like to know what time frame this Waterbury backmark is from. Thanks for your help.

 

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[Dug]

I seem to have misplaced my book on backmarks and would like to know what time frame this Waterbury backmark is from. Thanks for your help.

1870-1900 Fig 21 of McGuinn and Bazelon

 

[Mud Hut]

1870-1900 Fig 21 of McGuinn and Bazelon

Thanks ..I appreciate that.