[quote name='Bassassin' timestamp='1483724293' post='3209632']
Yes, it's a Matsumoku bass (good thing, most Hondos were Korean & not great quality) and yes, the bridge is bending as a result of 35-odd years of string tension - many Mat basses from this era have 3-point units made from cheese. They're not radiused, just rubbish, I'm afraid.
I have a Matsumoku-built Westbury Track 2 which had a very bendy bridge when I got it:
Did a bit of research and this is a very common problem which turns up on lots of late 70s/early 80s Mats with these bridges.
I found a period-correct baseplate for mine, otherwise the simplest solution is to replace it with an Epiphone or compatible unit, which will fit, or to upgrade with a fully adjustable Hipshot or Babicz replacement.
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Pity, I rather liked the idea it was "radius'd" as Paul mentioned theres no way to adjust the string height separately, why oh why did Matsumoku use these bridges when on my Aria Pro II CSB 300 and 450 they have far more sensible bridges.
Just Hondo's choice I guess.