I think the model-3 and model-7 blades are the two most graceful and visually appealing of all the Randall models... even though I have mostly m-1s, m-2s and m-14s. Art, your oldie is especially nice because I like the deeper choll that lends a kind of delicate look ... the "wasp-neck" from a couple of years earlier with a really deep choll has even more visual depth.
Here is a model-7 I found crusing the net. It may be one of the most beautiful and interesting of any model-7 partly because of its rosewood box and handle, and of course because of the initials of Mr. Randall on the ricosso. The story can be read at this link, worth the read:
http://svalbardrepublic.org/ebay/randall-boxed0910.htmIt has a fairly rare Johnson brown button sheath*, no model numbers on back, which probably dates the knife pretty precisely to late '62, early '63. This of course would be one of the first sheaths made by Johnson.
* this sheath has most of the characteristics of an early Johnson brown button... but the stitching seems poor.