Yes, pardner, them there blue ladies' Gillettes sure are purty !
I like them for the long handle and I think they are very well balanced. Same weight as a long handle Merkur, but the head is different on the Gillette, more rounded. I like the way the Gillette shaves, more so than the Merkur. I also have a short handle Gillette, but the head on it is slightly different and the handle is too short for my big hands.
They all date from the mid-1960s. There is usually a blue one available on eBay. You can also find them here: