Dear Laney, Pekka, and Board,
Let's see if we can clear this up a bit.
The coin illustrated for RPC IV Online 4033:http://rpc.ashmus.ox.ac.uk/coins/4/4033/
...is not only similar to Laney's coin, but is die identical (on both sides). I was able to track down this other coin listed in the specimen list: http://www.acsearch.info/search.html?id=72505
It was struck from the same die pair as well. And Laney is correct, there is no spear visible on the reverse die in question. So what we have here is probably an error in the RPC Online description. Therefore, I would cite Laney's coin as RPC IV Online 4033 corr. (spear), or something similar, until the error is fixed. Of course, to make the last happen, I would submit the new coin to the RPC editors and let them know what was discovered here.
As a side note, I think Tahberer's two coins would fit better under RPC IV Online 4987: http://rpc.ashmus.ox.ac.uk/coins/4/4987/
Tahberer's second piece, for instance, shares the same dies as the coin illustrated on the RPC website. This type does indeed depict Athena holding a spear.
However, going back to RPC IV Online 4033 again, I should point out another potential mistake. See coin #4, the last coin in the specimen list (C Lewis 1732):http://www.s110120695.websitehome.co.uk/PHP/SNG_PHP/04_03_Reply.php?Series=SNGuk&AccessionNo=0602_1732
The obverse die matches the coin illustrated for no. 4987, and Athena is clearly holding a spear, but the reverse legends are quite possibly different from either no. 4987 or 4033. So what we are seeing could potentially be a third variety deserving of a separate RPC number.
I hope most of this helped clarify things rather than muddle them.