Good morning from France and welcome on board.
Glad to see a fellow European here, we're not that many!!!
Your story about the old women made me laugh. It's funny to see how people in remote places can easily link unexpected things to religious matters!!!
500Hz is high, your horn should blow a lot lower, at least 300Hz.
I regret to say that your horn looks very much like a Supertyfon but it is not. First, the power chamber, it should be bronze with "Supertyfon" embossed on the back (like my avatar). Then the projector, it should be copper and a lot wider. This one is brass, tighter and with no round tag.
What you have there is a russian copy of the Supertyfon and made for the Czech Railways.
Check this very informative site from a russian fan of local Tyfons:http://www.gydkov.net/tifonologia.html
An english translation can be found here:http://translate.googleusercontent.com/translate_c?hl=fr&ie=UTF-8&sl=ru&tl=en&u=http://www.gydkov.net/tifonologia/tyfon-thehskiy.html&prev=_t&rurl=translate.google.fr&twu=1&usg=ALkJrhg1w4Wpz1pu-CCsezZzYBReVGpMbw
This is a good old product from Soviet Russia under Commies' rule, made from Western plans and distributed to its european valets.
But this certainly does not affect its sound qualities.
I have myself a czech horn found in Germany, made of steel and brass, it has a tag with "Kovotvar VD Kuty" stamped on it.
Sounds to be now a large galvanised steel manufacturer in SK.
Not really nice and reliable.
Say hello for me to Praha and its beautiful girls and to Brno and its beautiful rifles.