Anyone ever heard of this "grading" service?

https://www.etsy.com/listing/558670577/angs-ms-68-1889-morgan-silver-dollar?ref=shop_home_feat_4

or this one?
https://www.etsy.com/listing/543431618/sgs-ms-70-1976-s-1-dollar-silver-ike?ga_order=most_relevant&ga_search_type=all&ga_view_type=gallery&ga_search_query=ike dollars&ref=sr_gallery-3-14

 

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Treat them as raw and ignore any grades they gave it. Basement slabbers

 

see above

 

Run away...

 

SGS has been around scamming people for quite a while.
The first one is new to me.

 

What he said. Both are minor tier self slabbers.

 

The old adage is 'Buy the coin, not the holder.'... In these cases, totally ignore the holder and treat the coin as raw...

 

Yes to both.

First one is a fairly recent basement slabber using generic shells.

SGS (Star Grading Service) first showed up around 2002 and they were in operation until just a few years ago when they were all arrested for fencing stolen property. (Their primary business was as a pawn shop) SGS used three different varieties over the years and were notorious for calling most anything MS-70. It is difficult to find any SGS slabbed coin graded lower than MS-68. And even the 68's aren't common.