Take new pics, one from each side, and close and in focus, that clearly show all those molded in letters and logos that I can barely see now, from your current pic.
You did not say WHY you are looking for the manufacturer...
I believe this is an Eastman brand. If your vacuum breaker is bad (the part on the top) that is present in the first photo, but absent in the second and third photo, you can get a replacement at Amazon:
EZ-FLO 45417 Eastman Vacuum Breaker Repair Kit
by Peak Trading
Learn more: EZ-FLO 45417 Eastman Vacuum Breaker Repair Kit - Faucet Trim Kits - Amazon.com
If its leaking or something else, probably just better to replace the entire unit if possible. However, @havasu indicates quite accurately that you need good access to the part inside the house where it attaches to your cold water line. It may be readily accessible in a crawl space or basement, but might not be.
After a number of these broke on me, I re-plumbed them to include an old fashioned shutoff inside the house (I had a basement) with a threaded female adapter. When they broke then, I would turn off the water in the house at that point, go back outside, remove the two screws, unscrew the entire assembly, wrap the replacement (with a threaded male end) with teflon tape and replace.
Full disclosure: the reason why they broke is my fault. Leaving a hose attached when it goes below freezing. Was caught too many times with 50 degree days and 25 degree nights, not thinking of removing hoses around the house...
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