I am quite sure I have the identical binocular you describe.
510ft. / 1000 yrds?
Body contours are "squared off" as opposed to "rounded"?
Front and back lens covers with fancy silver insert with B&H logo?
Strap lugs on the outsides of the prism housings?
This binocular is a curious little monster to me. Yes JB191.
The example I own is in absolutely new condition. Not a mark on it.
It is my opinion that the optics are exceptional. Really good.
Despite the odd body configuration it is comfortable to hold.
It seems that the "mechanical" aspects of it are where it was compromised. Read, "cheaped out".
For some reason the entire focus shaft tends to too easily rock back and forth even though everything appears to be quite tight and in proper place.
I can't explain it but, the "construction" of these just doesn't inspire confidence.
The one I own has spent it's time on display in my cabinet.
Maybe I should give them a better chance and take them out for a while.
In fact, I seriously will.
But hey, if you've got a nice specimen and it works well, ENJOY IT!
And for the price you paid, I think you made a good catch!