Welcome to Net54.
Yes, Clark's Bread cards are very scarce or rare, depending on how one defines these terms. To verify authenticity, I suggest you submit them to one of the major card grading companies - either PSA (the largest) or SGC (my personal choice). Or, you could ask a collector or dealer who is very knowledgeable about the E121 and W575-1 issues for an opinion. Here's the link to a 2017 Net54 thread re the Clark's Bread cards: http://www.net54baseball.com/showthread.php?p=1718341
It's difficult to put a value on such scarce cards. Actually, their scarcity tends to work against their value because they are too scarce for anyone to attempt to collect a set of them. This leaves only type-card collectors and specific-player collectors to be interested in them. You can check VCP (Vintage Card Prices) for past sales info - VCP is a subscription service, and I think one can purchase a 1 day subscription for for a relatively low cost. Here are the links to two past sales:
https://www.ebay.com/itm/1921-Clark-...p2047675.l2557
http://loveofthegameauctions.com/rar..._-lot5545.aspx
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Seeking very scarce/rare cards for my Sam Rice master collection, e.g., E210 York Caramel Type 2 (upgrade), 1931 W502, W504 (upgrade), W572 sepia, W573, 1922 Haffner's Bread, 1922 Keating Candy, 1922 Witmor Candy Type 2 (vertical back), 1926 Sports Co. of Am. with ad & blank backs. Also 1917 Merchants Bakery & Weil Baking cards of WaJo. Also E222 cards of Lipe, Revelle & Ryan.
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