Deciphering my serial no.

While talking to Art Ciampi today about my FCT-100 I forgot to ask him about deciphering the blue tag on my FCT-100. I of course understand the D=100mm and fl 640mm, but below D, and FL it has < No. M.I 9806 > I take it it's the date made, but how do I read it? Made in 1998, 1986?

Thanks

If the number convention was the same back then as now,it's a 1998 #06.