The earliest dive light like this I saw was made by Allen Engineering in Belmont, California. I have a model 500B. The trade name was Dive Bright, was welded aluminum 4" OD tubing, and an 8¼" overall. The handle and rear-end cap were cast aluminum while the body and screw-flange were made from tubing and machined ½" plate. All the models I saw had a magnetic switch, 4" reflector, and 10 D-cells. I also have a later model that is all cast aluminum with the name Darrel Allen Corporation in the casting and a label inside with an address in Healdsburg, California. Both have a ½" x 4.475" diameter Plexiglas lens with 6 #6-32 stainless pan-head straight-slot screws and machined O-ring groove. The 500B model had a fabricated battery holder while the newer model as an injection-molded plastic holder.
They were by-far the most rugged and reliable lights of the day. The proportions of your light look different than the ones I have. It could be an earlier model, was inspired by these, inspired them, or was developed independently. The design was not especially clever or unique, rather than looking like the result of someone who was tired of the leaking plastic junk on the market with sealed beams. I don’t recall the price but it was much more expensive than the competitors.
I can’t remember if the 500B model came painted, anodized, or raw Aluminum. I painted mine blue and cannot detect any paint under it… though it is peeling all over. The later cast-aluminum model came painted yellow including the O-ring seating area. The paint is too soft for powder coating, which was pretty new in the early 1970s. I don’t recall ever seeing the USPEC Company.
What kind of switch and batteries does your use?
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This stroll down memory lane made me curious. Googling “darrell allan dive light” turned this up:
http://www.vintagescubasupply.com/accsview.html
Scroll down a little past half-way and you see both your light and the Darrell Allan.
BTW, that Navy lamp you show is still being installed on Naval Vessels, except they ususally have rechargable cells now and are mounted for emergency lighting. They may also be used as portables light. I think we referred to them as Lanterns in the 1970s.