---

The last 3 is not a 3.
It is an 8 as in A686

You are also missing the letter K or L in your HIN after the BWC (most likely it is L)
http://www.whalercentral.com/articles...cle_id=101

All HIN's are 12 characters in length with NO spaces.
So, you have:
BWCL1633A686
A6 means it was built in January of 1986
86 means it is a 1986 year model

See our info we have on our site:
http://www.whalercentral.com/articles...icle_id=61