I am posting images on two Hi-Powers that I have. The first is 38333a which is similar to yours. The other is 41533b, which is Eagle/N marked but has a similar feature with yours.
Right side: serial No. 38333a
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38333a-5a.jpg
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Right side: serial No. 38333a
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38333a-7a.jpg
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View of barrel and serial No. 38333a
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38333a-4a.jpg
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View of test proof - serial No. 38333a
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38333a-8a.jpg
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View of marking on left side of slide at the rear - serial No. 38333a
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38333a-9a.jpg
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It is interesting to note that there is a spread of approximately 60,000 numbers between your example and my example. If it was a military contract, then it would seem to have been filed over a long period of time.
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Right side: serial No. 41533b
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41533b-7a.jpg
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Left side: serial No. 41533b
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41533b-6a.jpg
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View of barrel and serial no. 41533b
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41533b-8a.jpg
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View of markings on left side of slide - (middle of slide)
(Only Eagle/N markings)
Download Attachment:
41533b-5a.jpg
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Closeup of Eagle/N marking:
Download Attachment:
41533b-2.JPG
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View of marking on left side of slide at the rear - serial No. 41533a
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41533b-1.JPG
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Note: This is the same marking that is on the two Hi-Powers Serial nos. 38333a and 98994a) with the test proof.
The only Hi-Powers that i have seen this marking on have been the Eagle/N marked Hi-Powers and the ones that have the test proof but no WaA marking.
I have proceeded on the premise that the marking on the left side of the slide, at the rear, indicated a commercial piece, since the marking was found on the Eagle/N piece. If the Hi-Power was divvereted to the commercial market, this fact could have been indicated by the marking at the rear of the slide. I could see a situation where the Hi-Powers were diverted because of a shortage of weapons for the home folk. I had based the fact of this diversion on the common maekings found at the rear of the slide.
But I can understand your premise that the Hi-Power, once a test proof had been applied, would not have went into the commercial market. This is very logical. Barring other explanations, it is logical that Hi-Powers such as 38333a and 98004 could have been part of a contract for Bulgaria. But there are a few questions why raises doubt (as to either theory).
Would any Hi-Power going to Bulgaria heve been military test proofed?
If there was a Hi-Power contract was for Bulgaria, wouldn't the serial numbers be in a block range instead of being spread out (one here and one there) over 60000/70000 pistols?
Why does the Eagle/N Hi-Power (considering that there is no question that it is commercial production) have the same marking as the Hi-Powers with the test proof? (yet I have not seen this marking on Hi-Powers that have a WaA marking.)
It seems that you are looking at it from one aspect and I am looking at it from a different one. Now all we have to do is to merge.