FN Serial Number Question

[Lionheart]

I've just acquired a High Power made in 1978, according to the letter code in the middle of the serial number.
I'm puzzled by the first three digits of the serial number. One source says, a 245 means that it is chambered for 9mm. Mine is 9mm but the first three digits are 215. The Blue Book mentions 215 but says only that it is "rare." I believe the Blue Book also says the first three digits are supposed to provide information about the place of manufacture. So I'm trying to figure out what I've got.
My gun has rubber Pachmayr grips with a thumb rest. Magazine safety. What looks to me to be the black enamel-painted finish. Right-hand safety only.
I'm still researching on my own, but would appreciate any info.

 

[Sunray]

Try asking here. http://www.fnhipower.com/

 

[Lionheart]

Thanks, SUNRAY

Great site, Sunray! Thanks!
I've bookmarked it.
The "215" is apparently a standard military model designation. The "245" referred to in the Blue Book is a sport model. So now we have a reference here if anyone should ask in future.
As usual, finding out one things has led to some confusion about another, so I'm headed back to the FN site to ask some more questions. My gun, for example, has no importer's mark that I can find. It's apparently Belgian made, 1978. The Pachmayr grips also don't seem right for my gun, though the Practical model had them. Of course, grips can be changed by anyone, anytime, anywhere.
The black enamel seems original, though the Blue Book says some models may have been painted to look like military issue.
Anyway,
Thanks again