Howdy
ALL Merwin Hulbert revolvers were manufactured by Hopkins and Allen in Norwich Conn. Merwin Hulbert owned a significant percentage of Hopkins and Allen. Although Merwin Hulbert was its own entity, all revolvers with the Merwin Hulbert name were manufactured by Hopkins and Allen.
I have a copy of Art Phelps' book,
The Story of Merwin Hulbert & Co. Firearms, which is the most authoritative book ever published about Merwin Hulbert.
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Sorry for the poor quality of these photos, I took them with my phone on the kitchen counter. The first photo is of a John P. Lovell Arms Company catalog from 1890. The second photo is from a Hartley and Graham catalog from 1891. If you can read the fine print, these revolvers were chambered for 32 S&W, not 32 S&W Long. The 32 S&W Long cartridge did not come into being until 1896, along with the the first S&W revolver with a swing out cylinder, the Model of 1896. They were chambered for 38 S&W as five shot revolvers, and also for 32 M&H, which was a proprietary cartridge. That may be why a 32 S&W Long cartridge fits into your chambers. This states the 38s were available as 5 shot revolvers and the 32 were available as five shot revolvers and a seven shot target version. I don't see any mention of a six shot 32.
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Interestingly enough, the patent for the hammer with the folding spur was held by Hopkins and Allen, not Merwin Hulbert.
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I have a Merwin Hulbert five shot 38 with a folding hammer. It was actually chambered for the 38 MH cartridge, but as near as I can tell that cartridge was dimensionally very similar to the 38 S&W cartridge. Notice all it says on the frame is 38 CAL, nothing further.
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Here is a close up of the patent date on the hammer spur.
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I have a feeling your revolver is not a true Merwin Hulbert, I see no sign of the characteristic joints on the frame and barrel that allowed the barrel to rotate and be pulled forward for loading. Like this. Also, I am unclear what the knob is near the hammer on your revolver. I have never seen that on a Merwin Hulbert revolver. Also, the locking slots on the cylinder do not look like the locking slots Merwin Hulbert used. Notice in the photo above, the slots have a hard edge on the top and bottom to capture both sides of the bolt. The slots on your revolver only have one hard edge, the hand is what prevents the cylinder from rolling backwards.
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Merwin Hulbert was very proud of their revolvers. A Merwin Hulbert revolver should have Merwin Hulbert stamped on it someplace. This is what is stamped on the top of the barrel rib on my little 38:
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I have a few large frame Merwin Hulbert revolvers too.
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They have Merwin Hulbert stamped on the top of the barrel.
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This one also has Hopkins and Allen stamped on the side of the barrel.
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I don't intend to rain on your parade, but Hopkins and Allen revolvers were known to be inexpensive revolvers. Although Merwin Hulbert revolvers were made on the same equipment in the same factory, they were a higher priced revolver in their day.
It would be helpful if you could provide a few photos of your entire revolver.