Classicshave.com still has a few of the NOS Filarmonicas, for sale on their site, the Doble Temple's are going for about $100, However your's is of nicer quality...... but at least this will start you off on the search. Your's also loooks to be a slightly larger blade, pics can be decieving though, that adds value also....
These tend to be very smooth shavers if you haven't already tried that edge BTW