Griswold Slant Have Different Handles?

[JLenzo]

Can anyone tell me why these Griswold Slant Large Block Logo #8 have different handles? One says 704 D and one is 704 B photos are paired cook surface and back. One has rib in the handle and one does not.

https://imgur.com/wDNIaLd
https://imgur.com/zLToI56
https://imgur.com/D2l0Xzj
https://imgur.com/5HLAGko

 

[GTurner]

http://www.castironcollector.com/griswoldskillets.php

 

[JLenzo]

Read that many times but did not mentally store the variations in the handles in the paragraph above the chart. Thanks!