Here are some pictures of my Stanley No. 60. My jig doesn't have a patent date on it which I think would indicate that it is a later model than John's. Mine was probably produced after the patent protection afforded by the 1909 patent had lapsed.
http://i56.photobucket.com/albums/g1...S_IMG_3106.jpg
It has an inch scale underneath instead of on top like the later models.
http://i56.photobucket.com/albums/g1...S_IMG_3090.jpg
As Bob has already pointed out the No. 60 came with 9 guides, 1/4 inch to 3/4 inch in 1/16 inch steps.
http://i56.photobucket.com/albums/g1...S_IMG_3098.jpg
The even 1/16 guides (i.e. 1/4, 3/8, 1/2, 5/8 & 3/4) all fit inside one another as do the odd 1/16 guides (i.e. 5/16, 7/16, 9/16 & 11/16).
http://i56.photobucket.com/albums/g1...S_IMG_3094.jpg
I also have an F.H. Prager dowel jig that is similar to and probably based on a Stanley jig.
http://i56.photobucket.com/albums/g1...S_IMG_3109.jpg
I find that the F.H. Prager jig is not as rigid as the Stanley. When you clamp the jigs onto a piece of wood, the F.H. Prager flexes a little whereas the Stanley doesn't flex noticeably. The drill guides from the F.H. Prager are however more robust than those that came with the Stanley and are therefore more suited to use with a power drill. Remember that the Stanley ones were designed for use with a brace and bit. I therefore tend to use the Stanley jig with the F.H. Prager drill guides if I'm doing any dowelling.