Can you identify this SMD-Component?

[SaabFAN]

Some time ago I bought some components that I labeled BAT60J in my parts-box, which they are clearly not.
I don't know exactly where I got those, but my Digikey Orders contain no parts that look like them.

It is a Tiny 4 Pad SMD-Package with a silver metal top and the following markings: I600T (could also be 1600T) E4Y19
Do you have any idea what part this is? Google Searches for I600T and E4Y19 came up empty so far.

[chicken]

16MHz crystal would be my guess.

[android]

Possibly Epson:

http://www.epson-electronics.de/electronics/cms/index/495

[SaabFAN]

Crystal sounds plausible.
I'll try to check it with my little home-made Network Analyzer.

If I remember corectly, I wanted to buy Pin-Diode arrays or fast switching diodes, but received these components instead. Wondering about the strange package, i just labeled the box to what was on the envelope (ebay order) and put the components in there without giving it much thought

[wraper]

Either quartz crystal or oscillator, most likely to be crystal. Crystal should have two GND pads on the opposite corners connected together and to the metal cap on the top. Oscillator likely will have only one GND pad.

[SaabFAN]

I just measured the components and got a rather interesting result:

I got a flat line when I swept them with my Network Analyzer (10kHz to 50MHz DDS-Based Scalar Network Analyzer with an Arduino as interface and controller: http://rheslip.blogspot.de/2015/08/the-simple-scalar-network-analyser.html) from 1MHz to 50MHz.

Then I had the idea of using my new R3131A Spectrum Analyzer and a noise source to see what the frequency response is up to 3GHz.
This is the result:





1.6GHz Notch-Filters. Or I connected something wrong/measured wrong and they are 1.6GHz SAW Bandpass Filters