I am waaaay out of my comfort zone here. But a Beta 21-equipped model from a very well-known brand in THAT condition, we're talking serious horology. And a not insignificant amount of value.
Have a listen to this podcast with James Dowling where he talks about Beta 21 watches:
https://www.time4apint.com/podcast/the-time-4a-pint-podcast-episode-33
You could try to contact James Dowling to hear more - but I am sure that there are collectors here on OF who knows their way around these.
@Tom Dick springs to mind
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