Can you identify immersionRC transmitter crystal?
While I haven't seen anything with that exact marking,
I speculate that it is perhaps a cylinder type 8.000 MHz crystal oscillator,
more or less interchangeable with the 8.000 MHz 
AB308-8.000MHZ,
MCRJ308000F18300HZH,
ECS-80-18-10X,
etc.

I speculate that the S80003H is perhaps exactly the part model as the S80009F,
but manufactured in a different week.
And so with exactly the same part number
except for the date code.

If, hypothetically, this company uses
International Rectifier's date code system,
then


"3H" indicates the 8th week of 2003 or 2013, and
"9F" indicates the 6th week of 1999 or 2009.