Hi Sappa......welcome to TFF.
We haven't been ignoring you! I've searching all of my databases for an A. Peterman shotgun and haven't been able to find anything.
A search of the Blue Book, The Standard Catalog of Firearms, and Flayderman's Guide To Antique American Firearms don't find such a gunmaker listed. Even a Google search didn't help.
I even looked it up under the "obscure makers" section at Shotgunworld and didn't find anything.
I'll keep looking......but in the meantime, you might want to go over to the Shotgunworld Forum and ask there....they're specialists on shotguns, their identification, and values.
If you find out anything, c'mon back and let us know......