Celestron SE series scopes weren't introduced until around 2005 and have an orange barrel. What you've got is usually referred to just as a "C8" (short for 'Celestron 8 inch').
I've never seen a Celestron serial number guide, but you may be able to spot the characteristic OTA style of yours in the following publication:
Uncle Rod’s Used CAT Buyer’s Guide (5.42MB PDF)