Their first ones that I recollect were like that. My very first scope was a Nikko Stirling Tiara with the integral rail/clamp. 4x15 or something like that. IIRC it was either a 3/4" or 7/8" tube and the field of view was like looking thru a length of 1/2" water pipe. On my first 22 it accounted for hundreds of rabbits.
I still have a 4x28 Tiara sitting unloved in a drawer. It too has the integral rail/clamp. Still nice and clear but like the earlier Tiaras a very narrow FOV.
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