ACME Philarmonic Professional Musician Brass Bell Diapason Resonance

Description

Perhaps the most amazing and unusual bell you ever came across; personally, after long research all over the net I couldn't find anything even remotely symilar. Your luck or knowledge might be different !
ACME Philarmonic Professional Musician Brass Bell Diapason
Resonance.
Please study carefully the  construction and "highly technological" (to say so !) hammer. It has some sort of dampeners on both sides appears to be made of some sort of thicker felt glows at the end of that white plastic cylinder) working in conjunction with 2 steel elastic blades ( blades have dampeners as well) that make the sound "vibrate / echoes ) about 15-20 seconds after one stops the motion. I don't find the right terms to describe it but kind of reminds me of that Diapason my music teacher used in class.
The leather strap has some markings (25 C) if that tells you anything ???
Questions ?
Welcomed any time but please don't hit me too hard; been around the block more than few times but never too far !