I was looking through some of my 151's and noticed something quite unusual ( Identical H.G. and Petticoat embossings) on 4 different CD 151 versions: from two early smooth bases continuing onto two drip point variations one of which has the NATCO embossing. The lettering is identical front to back. Also, the drip point dates on each of the later pieces are also identical to a t. Another interesting note is the differences each piece has from the other in the wire groove areas. None are alike??? Take a look. The pic is the best I have at this point and I will add one with the embossings over one another shortly. You think you have it all figured out and the more we look the more we find out........