Unique "sticky back" postcards with oval die cuts for insertion of a small portrait photgraph. 
These would date to the 1900s. 
I'm pretty confident all of these would be from the same family. 
Though unused, they do have wear and spots of foxing/staining & one of them has dried glue, so there's a "flap." See images. 
The original postcard, with you the glued on back is an import "Postkarte"  "Carte Postale." 
I'm wondering if they purchased flowered & other generic postcards & die cut them. 

The company was based in Burnley, UK. 

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Item will ship USPS First Class Mail shipping.  Priority & International shipping also available. 
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NOTE:  Sale amount will not be changed on customs forms if item is shipped insured, please consider customs fees when deciding to purchase & ask if unsure before purchasing.
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Ask any questions before bidding/buying.
Thanks for looking!

Location: Box EP1