There is a well documented example at the Flickr link below. My understanding is that the offset fork crown is the best way to tell.
On Fri, May 30, 2008 at 4:12 PM, Jeff Slotkin <email@example.com> wrote:
> Today I walked into the shop where I work and saw an old Allez made into
> fixie owned by our newest asembler. A little beat-up, but it sure looked
> like a 3Rensho bike to me. I've examined a few Allezes (?), but never seen
> anything this nice.
> So, nicely scalloped dropouts, lugs thinned everywhere, FD cable guide above
> the stay. She was glad to hear what I thought I knew, as she already loves
> her bike on its own merits, and welcomes a pedigree.
> However, I told her to look at CR to see more, and I don't see one there,
> nor do I see any pics searching online. >>>Anybody know where to get pics of
> a confirmed one of these?
> Next time I see the bike I'll likely take a few snaps of it, but that'll
> probably be July.
> Jeff Slotkin
> Charleston, SC
> P.S. Not my size, and I would have felt like a pimp trying to get it,