I thought that the Fender MIJ '51 reissue only came in blonde, whereas the similar sting version was avalaible in sunburst:
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&ih=007&sspagename=STRK%3AMEWA%3AIT&viewitem=&item=170109032431&rd=1&rd=1
I have a real vintage '55 sunburst P that was just restored, and have long been interested in these older Fenders and their reissues.
The Sting bass is basically a '55 RI, not a '51. The item the above link points to IS a valid Fender '51 RI, as you no doubt know. However, in 1951, P-basses weren't available in any color except that translucent Telecaster Ivory (or whatever it was called). Besides "Butterscotch Yellow," Fender also now makes the '51 RI in a sunburst. It is a modern poly finish, which, just like the finish on the Sting, is intended to look like a '54 or '55 nitro 2-color sunburst, even though the original '51 P-basses didn't offer this color. Why? To sell more basses, I suppose. Are we confused yet?
Whereas this one has no mention or sign of the Sting signature but is in sunburst. Can anyone give me any more info on this model?
Yes. The main difference between the '51 RI and '55 (Sting) RI is that the '55 (Sting) has a contoured body, which was introduced gradually by Fender, starting in 1955, IIRC. The '51 RI is a slab body.
Based on having playing several '55 Sting RIs, and also owning an Ivory 1991 '51 P-bass RI, IMHO the bridge, neck, and tuners are the same on these '51 RI and '55 RI basses. They come from the same Japanese factory, I think.
Having "1 Original Single-Coil Precision Bass Pickup," they can sound a lot alike. They come with very different strings, which does make a significant difference in sound and feel in the showroom. Hope this helps.