Here is a H. Belfield & Co altitude gauge. Seems to be in great shape. I have no way to test it to see if it actually works. What you see is what you get, its “AS IS”. Check out the pictures and see if you need it. For questions 419 789 1159 Original PartGreat shapeThe outside diameter of the bezel is 5-15/16″The diameter at the back is 6-1/2″For questions 419 789 1159 Thanks for looking at this listing! I am a real person who is easy to find. If you want to check out my reputation and such please feel free to google search my name.My name and address is: Jon RozevinkRozevink Engines LLC14316 State Route 281Holgate Ohio 43527 I am a well known collector and dealer of antique gas engines, parts for them, and related items. I try to list all my items very accurately so the buyer knows exactly what they are buying. Out of respect I ask you to please actually read the descriptions and look at all the pictures before buying or asking questions. I am glad to answer questions but I’m not always that good at emailing people back. If you can find a way to talk to me with your voice you will almost always get a quick response. If you message me please try not to sound like a caveman. I have terrible grammar myself so I understand but sometimes it is very difficult to comprehend what some people write. All of my items are listed “AS IS” and “NO RETURNS”. If I make a mistake on my measurements or you feel something is not as described please let me know and I will try to make it right. I think most all of my customers with a normal level of sanity are happy. My shipping time is set for 5 business days, weekends and holidays don’t count. I ship out most items quicker than that though. If you are worried about how soon I can ship an item please ask before you buy it. I travel a lot and have a family so I am not always on call 24/7 when it comes shipping items. I think most people would agree that I do an extremely good job of packing items so I guess it’s worth the wait.Please keep in mind I also really like to buy collections of gas engines and parts. I pay very well and am a very active buyer. I am looking for items for my collection and resale. Thank You!Jon RozevinkRozevink Engines LLCCheck out my other items!Be sure to add me to your favorites list!