They all look like Whisplers to me. I will assume you are not located in the USA. Saying what country you found the marbles in is often helpful. Collectors in the USA see marbles in the frame of reference of being found in the USA.
...so the marble is 13/16 in reality and you are positive without a doubt it is older than 2003... and yet you had no clue? I throw my hands up in the air. I don't think it would matter if I showed you 20 exactly like it.