I know (from kbb.com) that the HX models belongs to the Civics but what about Accords? I have no way of telling what the model is on my 90' Accord (no rear emblems) other than the registration papers that says it's a HX model (HO: HX). It's a 4d, manual transmission. If someone can please enlighten me on this subject i'd really appreciate it. If it helps any the vin is JHMCB7558LC103253

 

I believe in '90 they only had a DX, LX, and EX. Are your bumpers painted or are they the same color as the trim (black). If so, it's probably a DX. If it has a moonroof, it's an EX. If it has no moonroof but some power options like door locks or windows it's probably an LX.
It could possibly be a Canadian model or something...not sure on that though.

 

It can be determined by the engine code, and the color of your bumpers and sometimes sideview mirror.