One of my other favorites to collect.  The pizzelle (pronounced  pitt sell) is the italian version of scandinavian krumkake.  (The french/belgian version is a gaufrette)  A thin wafer/cookie.  The Pizzelle has a little more flour in it and is thicker.  It traditionally has an anise flavor.  I would guess this dates from the 1930's, maybe a little later.  They switched to wooden handles later.  They tend to be cast iron if much earlier.  A lot of manufacturers were in the Philadelphia area.  My favorite irons are made by Vitantonio from Ohio.
I don't think I would spend much time cleaning this up.  It's pretty decent.  The cream of tatar won't touch carbon, it handles stains and discoloration and is the last step I use.  If I really want to clean this I would see if it would fit in my self cleaning oven.  If not, I would heat the piece with a blowtorch and see if I could easily remove the handles, then run it through the self claning oven.  Then finish with cream of tatar with a steel wool polish.
Or you could use walnut shells and a sandblaster.  But I'd really not bother.
Carol, the SOS works great, but it is real coarse and will scratch aluminum leaving marks.  If I want to scrub I use a clear nylon scrubbing pad.  Then polish with 0000 steel wool - this won't leave noticeable scratches.  You onlly see the scratches with SOS if it is polished.
tom