Looks to be an AGM model 258. Look here American Gas Machine Co. lanterns – 1 – early models about mid way down the page. Brasso is not your friend with that lantern. Brasso contains ammonia which can be destructive to brass. Also, AGM founts are notorious for having stress cracks. Before you attempt to fuel it, pump it up and submerge the fount in a bucket of water and look for bubbles. If you find a crack in the fount it is an ornament not a lantern. Best of luck.
It does not have a standard pump, like coleman’s. I’m not sure how to pressurize it. Thank you so much for your help!
Welcome aboard! A separate pump is used to pressurise it, the filler cap is also a pressure valve and the link below shows a post about separate pumps. 9 lamp pumps.
Part of my reply was missing! Thank you for the info! Are parts and a pump still available? My lamp appears to be original, and complete.
Thank you for the information! I really appreciate your time, and willingness to share your lantern savvy!
Coleman pumps often turn up on Ebay and they will do the job. The link below is for Old Coleman Parts and they sell a reproduction pump and many other parts. https://www.oldcolemanparts.com/product.php?productid=1103&cat=&page=1
