https://pbs.twimg.com/media/ChNuYmeUoAAAhYA?format=jpg&name=large
Here’s a better picture of the markings and that’s all I could find. Went to my property where the stove is and really looked it over last night.
Thanks!

A bit odd but so far I have found nothing about this stove nor about the SPF & Co !! Have tried changing the letters and checking under the foundry name !! Have another list I will try to check today !!

I’m in Idaho, and the only lettering I see is on the door, which is in one of the pictures.
There is a circle around the letters and the S P F are in line with the P a little higher and the Co below the P with the & between them.

Those pics were better !! Can I ask what state you are in ?? Or where you got this stove ?? Having to look at the foundry name !! Also need to know exactly how it is printed on the stove ! ! SPF & Co.,,or Just SPF Even the punctuations are important !! Like S.P.F. & Co !! The foundry lists exact wording !!

I posted a couple links to the pictures I have hope you can see them.