Sweet Spot Letterman cards by UD

BBN

Just a question, but is the letter inside this card a real swatch from a jersey worn by these players. I know they made some for Rogers Hornsby, did he even have his name on the back or are these letters/swatches just reproductions similar to the style of jersies of that time? Thanks

yankeeno7

Repros

BBN

Thanks. That's what I thought. I assumed if they were real those cards would go for moon money and not $30-40