Need Input SGC grading Ruth, Mantle, Cobb

[tjenkins]

If this is in the wrong section advise me to move it and I apologize for the long post.

I am thinking about submitting my first high dollar baseball cards to SGC. I have never graded anything this big, so I am asking for some input from the experienced in this forum. I am basically submitting three cards all grading, what I assume, will be a SGC 1 mainly to have them Authenticated. I see graded SGC 1 values more than Authentic. The three cards are:

1933 Goudey Babe Ruth #144
1906 T205 Ty Cobb bat off shoulder (Polar Bear back)
1951 Bowman Mickey Mantle #253

So, I have done a little research by going to 130 Point to see what some of these card have sold for to get some idea of value. SGC says the the price is based on declared value. Who declares the value? EBay prices and me, SGC, Beckett, I have no idea.

Here is what I found at 130 Point.

(2) PSA 1 51 Mantles ($8000 and $5800, avg price $6900)
(5) PSA 1 33 Goudey Ruths #144 (avg price $4518)
(5) PSA1 T205 Cobb batt off (avg $2940)

The Ruth is faded and obviously from a scrapbook. The Cobb was also probably in a scrapbook and the Mantle has some loose paper around the "a" in Mantle on back but all intact.

Is this worth doing? If I am looking at this correctly grading them is going to cost me around $625 or so. I have included pictures of the three cards front and back. I purchased the cards a long time ago so if they are not authentic, so be it. Sorry, pics are not the best clarity. Any advise would be much appreciated thanks!

[IMG]20230225_120636 by Todd Jenkins, on Flickr[/IMG]

[IMG]20230225_120237 by Todd Jenkins, on Flickr[/IMG]