Sounds about right to me... some just said "Apex", some had a number.
There was an Apex #8 on the auction site not long ago, looked just like a regular Pearson Hunter, 58", zebra wood w/ black glass. I saw an Apex #16 recently too, that looked just like the Pearson Cougars from the early/mid 1960's. And there's an old thread at LW with pics of what looks just like a '60s Colt with white glass that says "Apex NO. 13 Ben Pearson".
So I'm curious to see what Long Shot's bow looks like... not many pictures of these bows are to be found.