My Filarmonicas are the #13 EPBD, and the #14 Novodur, Para Profesinals (sic).

I also have the same Iwasaki's that you have, well, I almost have. I bought the Iwasaki Tamahagane Friday evening, the last one in stock, and am waiting on delivery.
Congratulations, where did you purchase the tamagahane one? Aframestokyo from Tadeshi? He has a nice shop and reasonable prices. Especially for the tamagahane Iwasaki's as they're not so easy to find and fetch sometimes absurd amounts -a European shop I know has one but it's priced at +1200 USD. They can sometimes be found at Rakuten but unless you read Japanese that's a tough place to negotiate around. Or occasionally on the 'bay but caveat emptor, I've seen some advertised as 'tamagahane' but without the kanji indicating such (玉鋼 ) on the ura side.

Funny also to see how some people ascribe almost mythical properties to that steel while afaik from a strictly technical point of view it's inferior to modern steels. But one pays the premium for the aesthetic aspect, knowing the production method and the labor/care associated with transforming the raw material into a flawless instrument.

They still have a good supply of tamagahane (dating from the 1970's) in the Iwasaki forge but only produce them in limited quantities once a year and -at the time, don't know about now- don't really make a big profit out of them due to high production losses. Anyway, congratulations, it's a really nice shaver too, you'll see. But that goes for most kamisori, especially if like me you have an angular face, their smaller sized blades are easier to handle than a classic straight once one has the knack of it.