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I have purchased 3 lots over the past year.
I cherry picked mint stamps at extremely good prices 25% of cat.
All from US but WW modern stamps.

The experience was top notch, fast service, well packaged invoiced.
That does not suggest all are the same.

You can kinda tell by the Store and the response if you ask a question, the scans, etc etc.

With my Turkey collection, searching the more valuable issues, I see lots of mis-identified stamps, and doubtfuls, and over-priced.
Be cautious in your selections.

Good Luck.