I'd probably call in a member like
@Northernman at this point, he's the boss of Lemania around here AFAIK
But I believe the same group owned omega and lemania around that time, and there was a lot of shared use of parts between those two brands and a number of affiliate brands. The case in this thread is double stamped for both omega (145.029) and lemania (9658) refs so there's clearly intention of multiple uses, similar to the 9655 / 145.016 relationship. It's not clear to me who might be considered the first or original ref owner for these cases ie omega or lemania.
As for the lack of 'swiss made', I can't be certain but have a really close look at the bottom of the dial before the inner bezel - is that a hint of writing I see? Personally my guess is that the familiar markings are there but obscured by the large inner bezel.
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