Isn't that the stock filter that comes inside the FT 817 and 818?? The K5 version has steeper skirts and comes stock in the TS 830 and the Icom 703 and 706 as I recall. I've had a few, they all had that filter.? It is a ceramic filter, not mechanical, and the skirts are not nearly as sharp as a mechanical filter.?
In my 817, I've replaced the K14 stock filter with a K12 (Murata CFJ-455-K12 is the nomenclature, I believe) and it has steeper skirts and a slightly wider bandwidth than the K14 and I like the difference.? A bit more selectivity AND a bit more sound.