I have an old 2003 catalog.... the HP137R3 (not A1) is a pit bull chip..... the strip chip is a HP138A ...... I would assume (same as a wild ass guess) that your HP137A1 is a pit bull... and not the strip chip..... but not sure if the A1.... is just a version/year identifier....
HTH
If you are contemplating a new chip..... look no further than Eric Marshall at TurboTweak..... you won't find anybody that has anything but positive things to say about his chips. His chips are very reasonable too.