Hello Keong,
I guess back in 2004, the Exp1 was selling around MYR10K if i'm not mistaken after discount or not...
I would suggest go shop around few used shop and check out the current market price. as many has pointed also, the current price is around 9K. I last saw was 9K without box and can't remember if it's with paper, but it is a "T-dial", so price a bit high. But it can be different depend on your exp1 condition and if it come with full set, maybe worth a bit more.
You can PM me and I can tell you few website (if you don't know yet) where you can post your item and selling online the price usually higher then you sell it to a used-watch shop.
If you prefer to sell it to a used watch shop, can PM me too maybe I can help if they buy it back from you with a bit higher price (finger cross)
Good luck and once again, Welcome
Scott