Flat Top one is rim embossed SPRATT // PATENT and 1850 on the tab. Middle one is rim embossed SPRATT'S // PATENT and 1850 on the tab. The one on the right is rim embossed FEB.5.1850 // PATENT.

Looking to buy all the other styles made by Spratt, not pictured above.

Found some answers from a great handout compiled by Gleen Drummond, known Spratt specialist... The one on the right is Style"B.1" it's a Spratt mushroom head variant with no tab embossing.

Style "C". Is the Flat head. The one pictured above is the large size variant and is 1 3/4" tall. Style "C" were manufactured and sold between 1847 and 1859.

I am looking for the smaller size Style "D" that's 1 1/4" tall and also has a flat head.

Would also like to find an upgrade for the one on the right (found one), it's embossed PATENT above the tab and FEB.5.1850 on the opposite side of the rim.

The center one above is Style "B.2" it is also a Spratt mushroom head variant.